They boy said ________ couldn’t he work out the problem but his teacher didn’t know how to do it.
| A．though | B．never | C．hardly | D．not only |
The reason for his success is ______ he worked very hard.
| A．why | B．that | C．whether | D．how |
When we were young, every evening my brother and I ______ stay at home waiting for our mother.
| A．would | B．might | C．should | D．could |
______ I’m well again, I can go on with my work.
| A．Even if | B．As though | C．Ever after | D．Now that |
The government has to close those small factories to prevent the water of the river ______.
| A．polluting | B．from polluting | C．being polluted | D．polluted |
We agreed to accept ___________ they thought was the best engineer.
| A．whatever | B．whomever | C．whichever | D．whoever |