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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单项选择题
（） announcing his retirement, Mr. Kinsley has been busy trying to train his replacement.

A.Because
B.Once
C.Since
D.While
单项选择题
Mark's Warehouse Clearance Store is having sale with savings of up to 40 percent off on all clothing this weekend （） celebration of its 25th anniversary.

A.in
B.at
C.on
D.of
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