SO -> BECAUSE/ AS/ SINCE -> BECAUSE OF
1.  The weather was bad, so we postponed the picnic yesterday.
--> Because____
2.  It rained heavily. Therefore, they didn't go for a picnic.
-->As_____
3.  I love my city and that's why I will word there.
-->Since_____
4.  It was snowing, so we didn't go out for a walk.
-->We______
5.  Because it is national holiday today, you won't find many shop open.
-->It is______
6.  Because he was sick, he didn't go to school yesterday.
-->He was
7.  He behaved badly, that's why hefound himself in trouble.
-->Because of______
8.  She was careless, so she broke the cup.
-->Because of______
9.  The water is polluted, so we can't swim in that river.
-->Because of_____
10.  Because of too much exhaust fume, people have to wear gauze masks in the streets.
-->Because_____
11.  As the chemicals were properly combined, the prescription has brought about the expected result.
-->Because of______
12. She enjoyed the movie so much since it was really internet.
-->Because of_____
            SUGGESTIONS
1. I think people should protect the environment.
--> I suggest the environment______
2.   Why don't you clean your room carefully?
--> I suggest your_____
3.  Let's use public transport instead of motorbikes.
--> I suggest______
--> I suggest that we________
--> I suggest that public_________
4.  What about keeping the environment unpolluted?
--> I suggest_____
--> I suggest that we________
--> I suggest that the__________
5.  Let's collect garbage and put it in a nearby wastebasket.
--> Why________
--> I suggest______
--> I think we should________
6.  Let's use banana leave to wrap food.
-->I suggest________
7.  I think you should go to school by bus.
--> I suggest that______
8.  What about putting garbage bins around the school yard.
--> I think_______
9.  Why don't we do some reading  everday? 
--> He suggest_______
10.  Let's put garbage bins around the schoolyard.
-->I suggest_______
11.  You should spend some weeks in Dalat.
--> I suggest_________
12. Shall we help poor people?
--> Why______
13. I think you should use nets to catch fish.
--> I suggest_______
14. Let's save money to help poor people.
--> I think_________
15. Why don't we sing a song?
--> She suggest______
16. Why don't we go for a picnic on the weekend?
--> Let's__________
17. Let's go to word by bus.
--> What about________
18. I suggest collecting unsed clothes.
--> Let's______