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5.avoid +
6. behave 过去式
7.excuse me
8. as well as well as
9.loud loudly aloud
10.Roman 复数
11.explain
12. warn
13.litter,little
14.success 形容词、副词、动词形式
15. sometime,some time
16.risk +
17.candle model
18. host, hostess
6
5
4
3
2
1
obey traffic rules
pick flowers in the park
keep quiet in the library
drop litter everywhere
queue for our turn
leave the tap running
We should/shouldn't ……
We shouldn't drop litter everywhere.
We should drop it into rubbish bin.
We shouldn't leave the tap running.