It be the vocabulary that caused you the problem in the exercise because you know a lot of words.

She _________ down her book and ________ in bed.

It is hard for me imagine what I would be doing today if I　　in love,at the age of seven,with the Melinda Cox Library in my hometown.

Often, when he something that him, he wasted his time dozing.

We can’t visit the China space Museum because the price of the ticket is too ______.