Many teens don’t have enough sleep because they have too much homework, which ______ them up at night.
| A．makes | B．stays | C．turns | D．keeps |
Writing stories and articles _____what I enjoy most，
| A．is | B．are | C．was | D．were |
The number of students from the north ____small.
| A．are | B．is | C．have | D．has |
A number of students _____from the south.
| A．are | B．is | C．have | D．has |
No one except my parents _____anything about it.
| A．know | B．knows | C．is knowing | D．have known |
This pair of shoes ____made in Nanjing.
| A．is | B．are | C．have been | D．had been |