How many students are there in your class—There are forty-five students. One third of them are girls. ________ are boys.

still can’t help being anxious about his job interview.—Lack of self-confidence is his______, I am afraid.

r their common interests, they_____cooperated so smoothly in the investigation of the case

___ regular exercise is very important, it’s never a good idea to exercise too close to bedtime.

While doing shopping, people often can’t help purchasing the goods ________ through media.[ ]