所谓“投标”
参考答案：
是指承包商向招标单位提出承包该工程项目的价格和条件，供招标单位选择以获得承包权的活动。
-----Jack，could I use your bike？I need to go to the market this afternoon.
-----______！I won't use it.
A．Go ahead
B．Don't mention it
C．Take it easy
D．It's up to you
Professor Johnson’s retirement () from next January.
A. carries into effect
B. takes effect
C. has effect
D. puts into effect
