She plans to choose more courses about mechanical ____________.
A. engineering
B. engineer
C. engineered
D. engineers
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She said that she _______ in that country since 1953.
A. has worked
B. had worked
C. works
D. worked
It was unexpected but I could __________, I thought.
A. help out
B. help for
C. help on
D. help off
A lot of tall buildings _______in his hometown in the last three years.
A. have built up
B. built up
C. were built up
D. have been built up
He used to be a tour _________ before he came to China.
A. assistant
B. helper
C. guide
D. director
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