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1.I suggest using gas instead of burning coal.
2. Lan suggests having a picnic this summer.
3. What about saving energy?
4. I suggested using public buses.
5. I suggest taking a shower instead of bath to save energy./ I suggest that we should take a shower instead of a bath to save energy.
6. What about putting different kinds off waste in different places?
7. I suggest that we should use banana leaves to wrap food instead of plastic bags.
8. I suggest going to school or to work by bike to save energy.
9. What about putting garbage bins around the schoolyard?
9. I suggest that we should reuse and recycle empty bottles to save natural resources.
10. He didn't learn the lessons carefully, so he failed the exam.
11. Because the weather was nice, we spent the whole day in the garden.
12. Because my homework is long and difficult, I can't finish it on time.