We couldn’t relax until all the guests had left.
A.Not until all the guests had left could we relax.
B.It wasn’t until all the guests had left that we could relax.
C.It wasn’t until all the guests had left could we relax. 
D.A and B are correct

A country cannot be prosperous if it is not quite independent.
A.Unless a country is quite independent, it can be prosperous.
B.Without complete independence, a country can be prosperous.
C.Only when a country is quite independent can it be prosperous.
D.It is not until a country is quite independent can it be prosperous.

"Can children swim in this pool?""Yes. However, at no time___________ alone".
A.shouldn't they swim
B.they should swim  
C.should swim they    
D.should they swim

"I would like to apply for the sales position you advertised" "I'm sorry. No longer___________ applications for that position".
A.are taking we          
B.we are taking        
C.are we taking          
D.we taking

He spent all his money. He even borrowed some from me.
A.As soon as he borrowed some money from me, he spent it all.
B.Hardly had he borrowed some money from me when he spent it all.
C.Not only did he spent all his money but also he borrowed some from me.
D.Not only did he spend all his money but he borrowed some from me as well.

I don’t think Jim saw me, he___________into space.
A.just stared
B.was just staring
C.has just stared
D.had just stared

Helen________her keys in the office so she had to wait until her husband______home.
A.has left/ comes
B.left/ had come
C.had left/came
D.had left/ would come

–“________my glasses?”

– “Yes, I saw them on your bed a minute ago.”
A.Do you see
B.Had you seen
C.Would you see
D.Have you seen

–  “Who is Jerry Cooper ? “

– “                   ? I saw you shaking hands with him at the meeting.”
A.Don’t you meet him yet?
B.Didn’t you meet him yet?
C.Hadn’t you met him yet ?
D.Haven’t you met him yet?

 The price ____________, but I doubt whether it will remain so.
A.went down
B.will go down
C.has gone down
D.was going down