West Lake in Hangzhou is one of the most _____ scenic spots.
A. visiting
B. visited
C. to be visited
D. visit
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With a new technique ______ out, the yields as a whole increased by 27%.
A. to be worked
B. works
C. worked
D. work
If _____ for an explanation of the population explosion in the world, I would definitely find it difficult.
A. to be asked
B. be asked
C. asking
D. asked
Three robbers rushed into the bank with their faces _____ by black stockings.
A. to cover
B. covered
C. to be covered
D. covering不定式与动名词
Do you know __________ the pie out of the oven?
A. to take
B. have taken
C. when to take
D. being taken