23. go off to ； be off to 动身去 leave for;

22. in a few days’ time = in a few days =a few days later 几天后 　　after 和 in 的区分

21. go on separate holidays 分别去度假

20. unless = if not 除非...否则... You should not go rafting unless you know how to swim.(条件)

区分：until 　　　You must not get off the bus until it has stopped.(时间)

GRAMMAR

现在进行时表示将来的计划，打算 　　How are you getting to the airport?

一般现在时表示时刻表的将来 　　My plane leaves at seven this evening.

19. go rafting 去漂流

18. think about 考虑 think of 想到，想起 think over 仔细考虑 think out 想出

17. as with ....也一样 as to / for 至于；关于

16. be careful (not) to do sth小心(不)做某事 be careful about注意 be careful with小心处理；be careful of小心,当心

15. protect… from/against … 保护…免受…

14. watch out (for...) 留神； 提防