()you finish your homework, you can't watch TV.
A: If
B: Therefore
C: However
D: Unless
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-I'm sorry. Bob's not in his office. -()
A: Would you like to leave a message?
B: Are you sure for that?
C: Can you take a message for me?
D: Can you phone me?
Ten years have passed () he moved to live in the South.
A: from
B: when
C: since
-Excuse me, sir. Where is the post office? -().
A: You can't ask me.
B: Pardon? I have no idea
C: Please don't say so
D: Sorry I don't know, but you can ask the man over there
() students are learning English in China now.
A: Millions of
B: several millions
C: Million of