The earth will become worse and worse ________ we do something to stop her from being polluted.
A. if B. even if C. when D. unless
— Can you come and play football with me?
—______. I have a lot of homework to do.
A. Excuse me B. I’d like to C. I’m afraid not D. It’s a pleasure
--What would you do if you won a million yuan? -- __________.
A.I shall give it to charities B.I will buy snacks
C.I won’t put it in the bank D. I’d give it to medical research
—Excuse me, could you tell me ________ a book about music?
—Sure. They are on the second floor.
A. where can I buy B. where I can buy C. when I can buy D when I can buy
We must follow Sign ______ to save every drop of water.
A. 
B. 
C. 
D. 
Many people enjoy _______ the CD ________ Heart Strings.
A. to hear, calling B. to listen to, calling
C. hearing, called D. listening to, called
