The Internet is increasingly accessible at school and at home. _____many parents and teachers are sometimes not as prepared as we should be to warn children about Internet threats.

In the good care of the nurses , the boy is          recovreing from his heart operation .

Can you believe that in _____ a rich country there should be _____ many poor people?

To improve your spoken English, you’d better listen to the tape ______. 

Although China has developed its economy greatly, its per capital GDP is still         one-tenth of the United States.