C.Passive Voice
l. Every year, Viet Nam exports millions of tons of rice.
2. Vietnamese people celebrate their Lunar New Year Festival around January and February.
3.Our teacher always advises us to study harder on the second term.
4.The Library of Congress in the USA employs over 5000 employees.
5.Bad weather has delayed flight 202 from Miami.
6.Brothers Lazlo and Geogre invented the ballpoint pen.
7.The boy broke the window and took away some money.
8.Someone cut down the tree in the garden yesterday.
9.The artist painted a huge picture to raise fund for the poor children.
10. Mai wrote some articles about the damage of I storm.
11. They have celebrated the Teacher's Day largely since 1982.
12. Science and Technology have completely changed human' s life.
13. People have built this building of bricks, stones and cement.
14. Nga has typed the report about polluted environment for 2 hours.
Modal velrb
16. You must clean the floor before you paint it.
17. The girl has to decide to study law or pharmacy.
18. People can't learn a foreign language in this week.
19. Mr. Han is going to visit Hanoi on his work next week.
20. This company will organize an art exhibition next month.
21.A sudden increase in water pressure may break the dam.