I.Điền từ :
1. If the sun (shine) .......... now, we (go) .......... to the beach.
2. Water (freeze) ................ if the temperature (go ) ........... below 0C
3.Sea water is salty . If the ocean (consist) ............... of fresh water , there (be)............. plenty of water to irrigate all of the deserts in the world.
4. What ( you do ) ............. if you (have ) ............. a chance to meer aliens from outer space?
5. If he ( not start ) ................. at once, he ( not catch ) the last train.
II.Supply the correct form of the words.
1. It was (care) ............ of you to have broken the vase.
2. The volcano in the Philippines erupted in 1991 was the largest volcanic (erupt) .............. in more than 50 years.
3. If you want to attend the course , you must pass the (come ) examination.
4.In the 1990s , jeans became high fashion (cloth).............
5. Local authorities should prohibit and fine (heacy ) anyone using electricity to catch fish.