The scientists ________ on the new medicine for two years. They will succeed in no time.
| A．work | B．are working | C．have worked | D．will work |
The art club is for members only. You can’t go in ____ you are a member.
| A．unless | B．because | C．if | D．though |
I have a lot of rules at home, _________
| A．So has Peter. | B．So Peter has. |
| C．So does Peter. | D．So Peter does. |
I think _________ history about China is very important.
| A．study | B．studying | C．studied | D．studies |
--Have you found the information about famous people __ you can use for the report?
-- Not yet .I’ll search some on the Internet.
| A． which | B．who | C．whom | D．what |
It’s rude to laugh ______ others when they have trouble ______ something.
| A．at; do | B．to; doing |
| C．with ; to do | D．at ;doing |