19.My sister in Beijing is very busy and__________writes to me.
A. often
B. frequently
C. once
D. seldom
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20.This company__________children’s books.
A. encourages
B. researches
C. searches
D. publishes
21.How shall we__________with this problem?
A. manage
B. face
C. deal
D. control
22.The boy__________round the corner. And I couldn’t see him.
A. appeared
B. disappointed
C. discovered
D. disappeared
23.In__________, everyone has his own advantage and disadvantage.
A. variety
B. reality
C. facts
D. prize