Last night, before the exam, I went over the lessons_______I couldn’t keep my eyes open to stay awake any longer．
| A．before | B．until | C．unless | D．when |
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Two middle-aged passengers fell into the sea. ____, neither of them could swim.
A. In fact B. Luckily
. Naturally D. Unfortunately
－What are on show in the museum?
－Some pictures ____ by middle-school students.
A. taking B. having been taken
. taken D. being taken
Even if you are an experienced teacher, you sometimes ____ make some mistakes.
A. can B. must
. should D. will
His parents put a lot of effort into getting him ____ to a key school.
| A．accepted | B．received | C．announced | D．admitted |
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