Each time you look at an object, you ______ a picture.
A. took
B. are taking
C. are taken
D. have taken
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Water pipes ______ rusty after a period of use.
A. become
B. is becoming
C. are become
D. were become
This foreign scientist ______ in our college for fifteen years and does not want to leave.
A. worked
B. is working
C. works
D. has been working
______ to have dinner with us tonight?
A. Will you like
B. Do you like
C. Wouldn’t you like
D. Won’t you like
What I was uncertain about ______ whether they could overcome the difficulties.
A. is
B. will be
C. had been
D. was
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