These problems are hard to . Will you give me some advice?
| A．work out | B．look out |
| C．hand out | D．break out |
— do you tell him about the news?
—By an e-mail.
| A．How, sending | B．How, send |
| C．What, sending | D．What, send |
I used to to school by bike, but now I am used to to school.
| A．go, walking | B．go, walk |
| C．going, walking | D．going, walk |
There are some dangerous fishes in this river, and I’ve warned Jack here.
| A．not to swim | B．to not swim |
| C．swim not to | D．to swim not |
Chinese students often give small gifts or cards to their teachers on Teachers’ day to let them know _____.
A.how great they are
B.how great are they
C.what great they are
Tom found _____ difficult to learn chemistry well.
A.it B.that C its