There were dirty marks on her trousers _________ she had wiped her hands.
| A．where | B．which | C．when | D．that |
______they are most interested in is _____they can produce more and better cars .
A That ;how B What ; how C What ;what D That ; that
---- You have never seen an American film, have you?
---- ________. How I wish I had such a chance!
| A．Yes, I have | B．Yes, I haven’t | C．No, I have | D．No, I haven’t |
CCTV is exactly like a window on the world ____you will sit by it and fix your attention on what it shows .
A if B as C while D unless
________ if you want to do something, or you won’t be able to do it well.
| A．To try your best | B．Trying you best | C．Try your best | D．Unless you try your best |
Plants grow best _____ it is warm and wet .
A where B which C in which D that