Carelessness always contributes _______ car accidents. Therefore, drivers are advised to concentrate their attention _______ driving.

A. for; to   B. to; on   C. with; on   D. in; to 

With a lot of difficulties _______, they went to the seashore and had a good rest.

A. settled   B. settling   C. to settle   D. being settled

The number of people present at the meeting _______ two hundred and a number of them _______ from the countryside.

A. is, are   B. is, is   C. are, are    D. are, is

Giving up smoking is a slow and painful _______ for him.

A. pressure     B. process     C. motivation    D. profession

Busy _______ he was, he managed to spare some time to help plan the project.

A. while     B. although    C. as       D. when

The maths teacher demanded that all the students _______ the examination paper within one and a half hours.

A. would finish　B. finished    C. finish　 D. could finish 

You must keep it _______ in mind that education is the first productivity.

A. mildly  B. firmly   C. tightly   D. roughly

This word is wrongly spelt；a letter is _______.

A. left behind  B. left alone   C. left out   D. left off

It makes _______ big difference to keep calm when giving _______ first aid.

A. a, /     B. /, the        C. a, the        D. /,a

_______, the experiment will be successful.

A. If carefully doing       B. If it done carefully   

C. If carefully done           D. If doing carefully