20、Before the first non-stop flight made in 1949，it       necessary for all planes to land for refueling．

A．had been    B．has been    C．would be  D．would have been

19、You can imagine        one feels        everybody dislikes him．

A．when…if    B．if…when    C．if…how   D．how…if

18、We've published large quantities of books．This year        we've published three million．

A．only      B．just    C．alone   D．merely

17、       she is not so healthy     she used to be?

    A．How it is that；as     B．Why is it that；what

    C．Is it why；that         D．How is it that；as

16、What a tight volleyball game! We lost it        we all tried our best．

A．because    B．though    C．until    D．unless

15、―What sort of friend do you want to have? Someone beautiful?

―Well，it         be beautiful――that's not important．

A．mustn't    B．needn't    C．can't  D．won't

14、If I correct someone, I will do it with as much good humor and self-restraint as if I were the one         ．

A．to correct    B．correcting    C．having corrected  D．being corrected

13、It's too late；morning will be a         time for you to visit him．

A．good    B．better    C．best  D．great

12、The minister didn't show up at all although the dinner party was held        ．

    A．with his name          B．for the name of him

    C．in the name of him   D．under his name

11、These people once had fame and fortune；now        is left to them is poverty．

A．all that    B．all of which  C．all what  D．that all