Helen couldn’t go to France after all. That’s too bad. I’m sure she would have enjoyed it if _____.
5. China has made great progress in the sun’s rays as a source of energy.
4. Have you heard of the town when they built the dam?
3. The power station we visited half the province’s energy.
2.Operations which left patients and in need of long periods of recovery time now leave them feeling relaxed and comfortable.
二、单项选择 1. The of the Itaipu Dam took 30 000 people seven years.