He didn’t know English at all, so he can’t understand __________ the machine．
| A．what to control | B．to control what |
| C．how to control | D．to control how． |
---______ does he go to Guangzhou on business? ---Three or four times a year.
| A．How long | B．When |
| C．How often | D．What time |
I always go to the lake ____ the aftenoon, but Kate goes there ____ the night of Monday.
| A．in; in | B．in; on |
| C．on; in | D．on; on |
Jack _______ goes shopping, because he is ______ busy working.
| A．often; always | B．never; seldom |
| C．usually; sometimes | D．seldom; always |
Helen is my cousin. I often help ________ with ________ homework.
| A．he; his | B．his; him |
| C．him; his | D．him; he’s |
---We’re going to the Great Wall tomorrow. ---_______.
| A．You are so happy | B．It’s good for you |
| C．Oh, I know that | D．Have a good time |