You ______ wear sports shoes when you climb a mountain.
| A．can’t | B．shouldn’t | C．mustn’t | D．have to |
-__________snakes love music? -No，they are deaf.
A. Does B. Are C. Do
- on the desk？
-Yes, it is.
A. What's B. Where is C. Is Bill's bag
These are our books. Please look after_________.
A. their B. they C. them
It's time listen the music.
A. to; / B. for; to C. to ; to
Who do you write to?
A．want B．want to C．to