Since you have begun to learn French, you should ________ it．

A．stick to

B．insist on

C．go on

D．keep on

Cherries are sold by ________ weight, and books can be mailed by ________ dozen．

A．/; a

B．the; the

C．the; a

D．/; the

－How about this kind of fruit?

－Oh, this kind of fruit ________ lots of vitamin C and B．

A．remains

B．contains

C．includes

D．holds

Bill was doing a lot of physical exercise to build up his ________．

A．ability

B．force

C．strength

D．mind

I thanked the shop assistant for her good ________．

A．serve

B．service

C．servant

D．serves

Mr Smith ________ me to buy several ________ eggs for the dinner．

A．asked; dozen

B．suggested; dozens of

C．had; dozen

D．persuaded; dozens

Once a decision has been made, all of us should ________ it．

A．direct to

B．stick to

C．lead to

D．refer to

After I was told to ________ the army, the officer asked me if I would ________ the lecture to be given by the general．

A．join; attend

B．join; join

C．attend; attend

D．attend; join

My friend, who ________ on the International Olympic Committee all his life, is retiring next month．

A．served

B．is serving

C．had served

D．has served

The milk is ________．Please go to ________ the gas．

A．boiling up; turn up

B．boiling down; turn off

C．boiling over; turn off

D．boiling up; turn down