Find ways to praise the beginners，_______ they will lose heart someday．（ ）
| A． |
till |
B． |
and |
C． |
or |
D． |
but |
The policeman has caught the thief _____stole Mr．Li's wallet．（ ）
A．whoseB．whoC．whomD．which
It's said that the Weast Lake is one of the most beautiful lakes in China．Do you think so？
Yeach，I _____there twice bofore!It attracts lots of tourists from home and aboard．（ ）
A．have beenB．have goneC．goD．went
Waiter，I'd like some Ningbo Dumplings．
Sorry，sir．Ningbo Dumpings ______only for lunch and dinner．（ ）
A．serveB．served
C．are servedD．are serving
Have you returned the book to the library yet？
Not yet．Don't worry．I ______it soon．（ ）
A．returnB．returned
C．have returnedD．will return
I really want to join the square dance．Can I learn the dance well？
Yes，Mom!Nothing is impossible______you put your heart into it!（ ）
A．as long asB．as soon as
C．even ifD．unless