His whole schooling ________ no more than six years．

A．adds to

B．adds up

C．adds up to

D．is added up to

They have varied opinions on this point．“Varied”here means ________．

A．the same

B．differ

C．different

D．similar

Our world is made up of ________．

A．substance

B．matter

C．materials

D．things

Who do you think is the greatest writer ________?

A．lively

B．alive

C．live

D．living

Please go and bring your pen here．It is ________ you left it．

A．there

B．where

C．there where

D．where there

The price ________, but I doubt whether it will remain so．

A．went down

B．will go down

C．has gone down

D．was going down

More and more people choose to shop in a supermarket as it offers a great ________ of goods．

A．variety

B．mixture

C．extension

D．combination

Many words and phrases have been ________ this newly revised edition of the dictionary．

A．added up to

B．added to

C．added up

D．added in

Plastic and other similar rubbish that doesn’t ________ may not be thrown into the sea anywhere．

A．break down

B．break away

C．break off

D．break through

Nuclear science should be developed to ________ the people rather than harm them．

A．benefit

B．contribute

C．protect

D．affect