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21. The control centre soon lost _____ touch with ____ Flight 370 soon after it took off.

A. the; the       B. the; /        C. /; the        D. /; /

22.—So you gave her your phone?

—         . She said she'd return it to me when she could afford her own.

A.My pleasure     B.Not exactly      C.No doubt     D.No wonder

23.____ I'm mistaken, I've seen that tall man at a party before.

A.If            B.As            C.Unless           D.When

24. There are a number of methods to provide           relief from your toothache, which can’t cure the problem.

A. permanent         B. temporary        C. contemporary      D. consequent

25. There is a shortage of teachers in Western China, and it will fall on the 80s and 90s generations to           this responsibility.