— Where _______your books? — _______ in the bookcase
| A．is , It’s | B．is, They’re |
| C．are, it’s | D．are, They’re |
---how many students are there in the classroom?
---_____Idon’t know where they have gone.
| A．No one | B．None | C．Nobody | D．Nothing |
Our playground is not so tidy and beautiful as before. Students must _____ dirty things on it.
| A．be stopped to throw | B．be stopped from throwing |
| C．stop to throw | D．stop from throwing |
I _____ this book for two weeks. I have to return it now.
| A．borrowed | B．have borrowed | C．kept | D．have kept |
—Do you think a radio is useful in learning English?
—Sure. A radio can _____ listening English songs and reports.
| A．be used by | B．be used as | C． be used for | D．be used to |
—_____ swim in the river?
— oh, no. Our teacher told us ____ here. It’s dangerous.
| A．Why don’t; not swim | B．Why not; not to swim |
| C．Why not; don’t swim | D．Why don’t; don’t swim |