Keys Every N Frames的含义是（）。

A:每帧的计算间隔 B:每N帧一个关键帧 C:一帧有个N关键帧 D:每N帧计算一次

Mary ______ her keys in her office and she had to ______ out of the house.

A:forgot, keep B:forget, keep C:left, be kept D:leaved, be kept

Personal relations are the keys to doing business in Arab countries.

The children found a ______ of keys in the street.

A:reel B:bunch C:suite D:group

Mary （）her keys in her office and she had to （）out of the house.

A:forgot, keep B:forget, keep C:left, be kept D:leaved, be kept

Personal relations are the keys to doing business in Arab countries.

The father was unwilling to give his son the keys to his car.

A:reluctant B:eager C:pleased D:angry