The chief of police………work is very important takes care of the public safety. 

Sandstorms               .

Recent             advances such as the internet are proving very useful for conservationists.

This magazine is ______ once a month.

My sister is a _________. She works in a hospital and helps doctors.

With six children on her hands, she is extremely busy. 

________ form of transport is as popular as the private car.

The author suggests that when children make mistakes, they….. 

The woman was too weak to lift the suitcase. 

You can't really go              in the countryside nowadays without seeing some evidence of man's influence. 

After leaving university , he decided to ______himself to a career in music. 

We have to …….military service in our country. 

The rivers can be…………..by chemicals. 

Would you mind ________ the door?

The creation of nature reserves will help to ensure the _____ of many endangered species. 

He enjoys learing languages __________ he finds them difficult.

He last had his blood tested ten months ago. 

The books are heavy. ______ can't carry them.

It’s raining hard, _____ we can’t go to the beach.