Section A (15 marks)
Directions： Beneath each of the following sentences there are 4 choices marked A， B， C and D. Choose the one answer that best completes the sentence.
21. There are quite a few idioms _______ colors are used, ______ in the dark is an example.
A. in which; with which B. whose; by which
C. where; for which D. in which; of which
22. ---Did you sleep late last night for you look tired?
---Yes, it was almost 12:00 o’clock _____ I went to sleep.
A. before B. that C. when D. until
