16.　 If you drive a car, you must f_________ your safety belt.

15.　 The plane couldn’t fly because there were something wrong with two of its ________(发动机).

14.　 The days from Monday to Friday are often considered to be the w________

13.　 Generally speaking, the s__________ of touch of a blind man is better than that of a healthy one.

12.　 After many experiments, Galileo drew a c__________ that light things drop onto the ground at the same time as heavy things if no air holds them back.

11.　 There is no d__________ that men are stronger than women.

10.　 The __________(震惊) news came that on March 11 over 200 people were killed in Spain.

9.　　 Can you give me a s__________ knife so that I can cut off the s__________(细绳)？

8.　　 Do you have an __________(电) fan to cool in summer?

7.　　 Don’t worry about anything! Everything is under c__________!