问题
填空题
根据句意及首字母提示补全单词。
1. China has a p_____ of about 1.3 billion.
2. The bad air makes my chest hurt and it's difficult for me to b_____.
3. A_____ we have built the Green Great Wall, we still need to work hard to protect the environment.
4. W_____ you go there, please telephone me. I'll go with you.
5. There's no d_____ that computers are widely used by workers.
答案
1. population 2. breathe 3. Although 4. Whenever 5. doubt
