David said he would stay here until his mother () back.
A. comes
B. will come
C. came
D. would come
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The two good friends () until Miss Wu came into the classroom.
A. chated
B. chat
C. are chatting
D. chatted
It () away a moment ago.
A. is flying
B. flyed
C. flew
D. flies
When () your mother () you that blue dress, Mary?
A. does, buy
B. has, bought
C. had, bought
D. did, buy
----Hi,Jim! Nice to meet you!----Hi, it is one year since I last () you.
A. saw
B. see
C. seeing
D. have seen