--Haven't you seen Mr. Wilson at the lecture?--Yes, but he had left ________

--Haven't you seen Mr. Wilson at the lecture?--Yes, but he had left _________ I could ask him any questions.

#49756

when

before

after

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I’m ___ duty today. I must clean the classroom _____ school.

#47280

after; on

in; before

on; after

for; in

Mike often exercises      half an hour in the morning.

#47858

with

for

---Can I help you? --- I want to buy something _______ presents _______my mother.

#46324

for; for

as; for

as; to

like; to

---- Oh, there are so many bottles. All of them are full _____ water. ---- Yes，but who filled them ______ water?

#46157

with; of

with; with

of; with

of; of

I am going to buy ______ rice ______ this afternoon.

#49710

some, on

some, in

any, /

some, /

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