[ FOR & SINCE ]
I have been waiting _______ 4 o’clock.
A. since
B. for
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Grammar › ViewHuachen and Ashton have decided to __________ the school carnival.
A. attend
B. attends
C. attended
D. attending
Modals › View
You ______ have told me before borrowing my bicycle
A. should
B. can
C. may
Present Perfect Tense › ViewHow many books has the author _______ so far? About five books.
A. write
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Grammar and Vocabulary › View
Sam and Kevin are running ________ the park.
A. on
B. in
C. under