(A number of) foreign visitors (were taken to) the industrial exhibition (which) they (saw) many new products.（　）

A:A number of B:were taken to C:which D:saw

Great changes (have) (taken place) (since) I (had visited) the city.（　）

A:have B:taken place C:since D:had visited

Gallaudet University currently does not allow students to keep pets in their dorm rooms. Exceptions are made only for (1) animals such as guide dogs and hearing (2) But other kinds of pets can be (3) to students too. Pets should be (4) to live in the dorms because they can help students reduce stress and learn responsibility.
College life is very demanding. Pets could help students relieve (5) in many ways. For example, playing with pets could give students a study (6) . Walking a dog or playing with a cat would allow the students to relax their body and mind. When the students return to their studying, they would feel (7) and ready to work again. Pets could also (8) social stress or homesickness. A dog or cat could provide companionship and affection when students have problems (9) their friends or miss home. Sometimes it is easier to talk to a pet than to a person. Talking about problems helps students figure out (10) .
Caring for pets could help students learn (11) in several ways. For example, pets need to be fed and watered on a regular schedule. Some pets also need to be taken out while others need their litter box or cage Cleaned. Students would learn to schedule time for these chores (12) their classes and activities. New students are often used to having their parents do things for them at home. Therefore, caring for a pet is something students would have to do (13) at school. They would learn how to solve problems on their own and how to follow through with their commitments.
In conclusion, living with pets would offer many (14) to Gallaudet University’s students. I believe that Galladudet should (15) . changing its policies to allow students to keep pets in their dorm rooms.

A:allowed B:forbidden C:fed D:taken

The second injection should have been given once the first drug had {{U}}taken effect{{/U}}.

A:taken place B:injected C:worked out D:worked

The second injection should only have been given once the first drug had {{U}}taken effect{{/U}}.

A:taken place B:injected C:worked out D:worked

阅读下面的短文，文中有15处空白，每处空白给出了4个选项，请根据短文的内容从4个选项中选择1个最佳答案。

A:performed B:carried C:brought D:taken

下面的短文有15处空白，请根据短文内容为每处空白确定1个最佳选项。

UFOs
Sixty years ago, a man named Kenneth Arnold saw something that we can still (1) today - something that changed popular culture for ever.
Flying his plane over mountains in the US state of Washington, he saw a line of strange objects, either crescent-shaped (月牙形的) or disc-like, flying (2) the motion of a saucer (碟) skimming (飞速掠过) on water.
The media soon picked up on the story - the Flying Saucers were here! Was the earth being (3) by creatures from another planet Soon, so many sightings were made that the US military began to (4). It called these strange objects UFOs - Unidentified Flying Objects, and that is how they are (5) today.
Military investigations found no evidence of visitors from outer space. But that did not stop the true (6). The military were (7) up, they said. Or maybe it was because the travelers from space were of such superior intelligence (8) they could hide from military analysts (分析家).
People have always seen strange lights in the sky. In the past these were explained in (9) ways. In a world where religion was less influential and science fiction was popular, signs from God were replaced by visitors from other (10).
The date of the first UFO sightings was also significant. In 1947, World War Ⅱ had just ended and the (11) War was just beginning. Humanity seemed locked in endless conflicts. Like generations before them, people looked. (12) the skies for help. But instead of seeking God, they looked for help from super-intelligent aliens (外星人) with (13) technology. Belief in UFOs became the first religion of science.
However, even people who believe in UFOs are not quite sure why they visit the earth. The universe is a big place and it is (14) to assume that there is life somewhere out there. It is possible that aliens have worked out how to travel through space. Yet some people report that they have been taken by aliens and have had experiments (15) on them. Why would anyone travel across half the universe to conduct medical experiments on people living in small towns in the United States

A:performed B:studied C:brought D:taken