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

6. 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.

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

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

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

2.　　 Einstein’s theory __________(证明) to be true at last.

1.　　 Students must c___________(做) e_____________ when they study physics or chemistry.

9..　 --Where are you going?

--Oh, there goes the bell. I am going to listen to the l_______ given by Dr. Li.

Unit16 Word spelling　　　

8.When she r________ her mother's voice on the phone, she jumped with joy.

7.How can you consider that I can’t pay off the d______? I am quite able to pay back what I have borrowed from you.