Before you put forward an argument, you should collect facts ________ your viewpoint.

A. which to base on                       B. with which to support

C. with which to base                       D. which to support on

Shining down out of a blue sky, ________.

A. they were burnt by the fierce sun              B. the sun burnt their pale skins

C. their pale skins were burnt by the son             D. and the sun burnt their cheeks fiercely

--Do you know any result about the operation?

--No. what we only know is that the doctors________ it the whole morning.

A. carried out                              B. have carried out

C. were carrying out                              D. have been carrying out

It is a good plan in theory, but it ________ to be seen if it works in practice.

A. remains           B. stays             C. stands            D. waits

--There must be a dozen pens in this house but I can never find one when I need one.

--Keep looking. ________ is sure to turn up.                     

A. One               B. It                  C. That               D. This

What a pity! I missed my father at the airport because my car was ________in the traffic jam.

A. broken up           B. kept back           C. held up           D. kept up

People try to avoid public transport delays by using their own cars, and this ________ creates further problems.

A. in turn             B. once again           C. in case                   D. after all

No matter how frequently ________, the works of Beethoven still attract people all over the world.

A. performed                              B. performing

C. to be performed                          D. being performed

The boss says he needs an assistant that he can ________to deal with the problems that may occur in his absence.

A. turn on             B. turn up             C. count up          D. count on     

You don't seem very________ about the party. Don't you want to attend it tonight?

A. crazy              B. enthusiastic          C. worried           D. anxious