Internet (has made possible) (for people to know) what (is going) on (all over) the world.

A:has made possible B:for people to know C:is going D:all over

They are busy ______ in their lessons before the exam.

A:going after B:going over C:going by D:going ahead

Peter is {{U}}experiencing{{/U}} a difficult period in his life.

A:going into B:going out of C:going over D:going through

Peter is {{U}}experiencing{{/U}} a difficult period in his life.

A:going into B:going out of C:going over D:going through

Peter is experiencing a difficult time in his life.

A:going into B:going out of C:going over D:going through

Peter is experiencing a difficult time in his life.

A:going into B:going out of C:going over D:going through