This is ____difficult problem that few students can work it out.
A. so
B. so a
C. such
D. such a
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— Wow! How cool your cup is! — Really? I ____ it when it was on sale yesterday.
A. buy
B. will buy
C. bought
D. am buying
__ carefully,Michael!There's a school ahead.
A. Drive
B. To drive
C. Drove
Driving
Tom,it's cold outside .__ your coat when you go out.
A. Take off
B. Put on
C. Put away
D. Take away
Mr. Wang is too tired. He should rest for ____ days.
A. a little
B. little
C. a few
D. few