1. The Middle East is rich in__________(石油).
2. A cow__________(重)many times than a sheep.
3. We should protect the__________(野生的)animals.
4. Li Ming works for the panda__________(研究).
5. The twins are__________(成人)now and they should do things by themselves.
答案: 1. oil 2. weighs 3. wild 4. research 5. adults
