This is __D__ 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 __C__ it when it was on sale yesterday.
A. buy
B. will buy
C. bought
D. am buying
— When will we start? — As soon as your uncle __A__.
A. arrives
B. will arrive
C. was arriving
D. to arrive
— What do you think of this book? — __C__.
A. It’s ten yuan
B. It’s my brother’s
C. It’s interesting
D. It’s a gift for me
We didn’t catch the train __B__ we got up late.
A. so
B. because
C. until
D. before