This liquid _____ the salt at room temperature.
A. became mixed with
B. was mixed by
C. mixes with
D. has been mixing by
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An exhibition of paintings ____ at the museum next week.
A. are to be held
B. is to be held
C. are holding
D. will hold
I'm sorry, sir. Your recorder isn't ready yet. It _____ in the factory.
A. is being repaired
B. is repaired
C. has been repaired
D. hasn't repaired
Every possible means , but none prove successful.
A. has tried
B. has been tried
C. is being tried
D. tried
My little sister has broken my watch. ---- My watch _____ by my little sister.
A. is broken
B. has broken
C. have been broken
D. has been broken
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