It is to read the books our teacher recommended , for they are well _____ reading.

You _____ tell him. He is fully aware of the danger.

What does the boss think about…; it is impossible to finish the work in a day!—Calm down. After all, he is the ________.

system is a major purchaser of goodsand services ,_______over $4 billion a year .

What a pity! You missed the beginning of the movie,it __ for 10 minutes.– Oh, a traffic jam!