英语：根据句意和所给汉语,完成单词.
1.That's___(单行的)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 ____(损害)the environment?
5.Don't____(吐痰)in a public place.
6.We need to do better in ____(保护)the environment.
7.Everyone enjoys travelling _____(除他外).