This plan I mentioned just now is ________ to discussion.
A. open
B. opened
C. opening
D. openness
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When I was cooking, it suddenly ________ to me that I had forgot to buy salt.
A. happened
B. came
C. occurred
D. thought
I don't want to go out ________ the heavy rain outside.
A. because of
B. for
C. because
D. since
Go and buy a copy of this book. It is still in ________.
A. shop
B. stock
C. sale
D. store
It seems that Mary has some trouble ________ this sound.
A. pronouncing
B. pronounce
C. to pronounce
D. to pronouncing