21. ---come on, baby! you will succeed. we all wish to get good news.
----______________ , but i’ll do my best.
a. no problem. b. it is impossible. c. i can’t promise. d. don’t worry.
22. ---did you receive the letter the next day?
---no. somehow, it was three weeks__________ i received it.
a. since b. when c. that d. before
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