1．Friendship is always a sweet responsibility (责任), never an opportunity.
2．Recycling (回收利用) is good for the environment, but it costs a lot of money.
3．Production (产量) of computers has increased double in the last few years.
4．Don't be so greedy (贪婪的) — leave some of the food for the rest of us.
5．The driver got injured so badly that he needed operating on without delay.
6．After a long debate the House of Commons approved the bill.
7．The Yellow River originates in the west and flows eastwards into the sea.
8．As far as I am concerned,_you can do what you like.
