在位移法中，杆端转角以______为正，杆件两端的相对线位移以______为正。

A、Not only is he a dancer

B、He is not only dancer

C、A dancer not only is he

D、Dancer is not only he

______, but he also proved himself a good athlete.

A．He showed himself not only a good student

B．He showed not only a good student

C．Not only did he show himself a good student

D．Not only he showed himself a good student

______a good student but he also proved himself a good sportsman.

A．He showed himself not only

B．He showed not only himself

C．Not only did he show himself

D．Not only he showed himself

Not only was he good at English () at mathematics.

A、so

B、as

C、but also

D、and also

He is the only one of the students who good at chess.

A、do

B、is

C、does

D、are

My father is good at solving this kind of problem. If only he ______ here!

A．were

B．will be

C．was

D．is

She is a good singer. She ______ a lot every day.

A．sing

B．sings

C．sang

Eaton’s success lay primarily in that ____.

A. he sold only good quality goods

B. he was the first person to provide good service

C. he treated his employees better than any of his competitors

D. he won respect from his customers

My father is good at solving this kind of problem. If only he ______ here!

A．were

B．will be

C．was

D．is