—I wonder what makes you a successful manager.
—I ________ as a waiter for five years，which contributes a lot to my today’s work.
A．serve B．have served
C．had served D．served
The traffic rule says young children under the age of four and ________ less than 40 pounds must be in a child safety seat.
A．being weighed B．to weigh
C．weighed D．weighing
—What do you think of the 2013 Spring Festival Party?
—Well，great！But I don’t think much of ________ held last year.
A．the one B．it
C．one D．which
Due to the widespread ________ of this medical technology，more diseases can be discovered and treated at an early stage.
A．presentation B．application
C．qualification D．appreciation
—________ one and a half months enough for the project to be finished?
—I am afraid not.The professor is ill and only after he recovers ________ go on with it.
A．Is；he can B．Are；he can
C．Is；can he D．Are；can he
Look！The ground is wet.It must have rained last night，________？
A．hasn’t it B．didn’t it
C．mustn’t it D．hadn’t it
