—____________
| A．Why not? | B．Yes, help yourself. | C．Go ahead. | D．Y es. You’d better not. |
In order to encourage the workers to work hard, the manager decides to award _______ produces the most in the factory.
| A．who | B．whom | C．whomever | D．whoever |
I’d like to study law at university ________ my cousin prefers geography.
| A．as | B．though | C．while | D．for |
Almost all the students were having classes when the earthquake _________.
| A． broke out | B． put out | C． came out | D． got out |
______ more attention, the tree could have grown better.
| A． Given | B． To give | C． Giving | D． Having given |
You _____ leave all your clothes on the floor like this!
| A． wouldn’t | B． mustn’t | C． needn’t | D． may not |