I'll go to your birthday party if I___free tomorrow.
A. am
B. was
C. were
D. will be
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How are you doing?
A. Fine.
B. Thank you.
C. En.
D. OK.
Don't talk here. The baby ______.
A. is sleeping
B. are sleeping
C. sleeping
D. sleep
--Please write___me as soon as you return to Hangzhou. --Yes, I will, Bill.
A. a letter
B. for
C. a letter for
D. to
China lies ______the east of Asia .
A. on
B. at
C. of
D. in