Scientists concluded that smoking ______ harmful to a person’s health.
A. is
B. be
C. being
D. was
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That was the fifth time that he ______ about that touching film in a month.
A. had talked
B. have talked
C. talked
D. was talking
The nurse ______ on a night shift for several weeks.
A. is working
B. works
C. worked
D. has been working
We’d better go out tomorrow because Susan ______ the violin all day.
A. will be practiced
B. will be practicing
C. practices
D. would be practiced
I have no idea of whatSam ______ at this time tomorrow.
A. will be doing
B. will do
C. does
D. is doing
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