英語：根據(jù)句意和所給漢語,完成單詞.
1.That's___(單行的)street,we can't go along the street.
2.I'd like to book a ___(往返的)ticket.
3.You mustn't ____(倒人)waste water into the river.
4.What things can ____(損害)the environment?
5.Don't____(吐痰)in a public place.
6.We need to do better in ____(保護(hù))the environment.
7.Everyone enjoys travelling _____(除他外).