The reason for his success is ______ he worked very hard.
| A．why | B．that | C．whether | D．how |
You must notice ______ the emergency exit is when you enter the building.
| A．which | B．where | C．what | D．in which |
Oh, I’m not feeling well in the stomach. I ______ so much fried chicken just now.
| A．shouldn’t eat | B．mustn’t have eaten |
| C．mustn’t eat | D．shouldn’t have eaten |
Changing the design of a new product may ______ the risk of its production in the market.
| A．bring about | B．come about | C．bring up | D．come up |
Why don’t you ______ it to his attention that you are too busy to go on working?
| A．pay | B．fix | C．bring | D．draw |
No sooner ______ down on bed ______ the telephone rang.
| A．had he lain, than | B．had he lied, when |
| C．did he lie, than | D．had he laid, before |