I watch TV ______ the evening. What about you? [ ]

Is this Tommy’s suitcase?— No, it is not . It is .

Listen! There is a knock on the door．Who _____ it be?—It must be Jack．Just now I sent for him．

We can see __sun in the day, and we can see ___many stars at night.

American students have ______ weeks ______ in summer holiday than Chinese students.