单项选择题

The newly installed alarm system, which is directly connected to the police, will go off if the correct security code is not entered （） 60 seconds of touching the keypad.

A.only
B.under
C.within
D.directly

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After a long and difficult strike, the plant workers will show up to work （） Monday.

A.starting on
B.afterwards
C.instead
D.outside
单项选择题
The majority of the contract （） that took place during the year were handled by lawyers from a local law firm.

A.negotiate
B.negotiations
C.negotiable
D.negotiator
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