请教几个英语单项选择

Could you please tell me the way to the station?
Sorry,I'm stranger to .You ask the poliseman over there.
A.must B.may C.need D.should

You've made mistakes this time ever before.
A.few B.little C.fewer D.less
Travelling by air is more expensive than by train even though the are tickets are on discount .
A.very B.a lot of C.many D.far

Though the price of the camera is OK, I don't think I'll take it.
A.but B.and C.yet D.so
The city is trying to the living environement of the people.
A.improve B.rise C.lift D.increase

1.B
You ( may )ask the poliseman over there.
你可以问一下那边的警察.
may 在这里表示对方提出的建议。
must 表示命令的语气，意思是：必须。

2.C
You've made ( fewer ) mistakes this time than ever before.
比较级,mistakes是可数名词，所以用 fewer.

3.D
Travelling by air is ( far ) more expensive than by train even though the are tickets are on discount .
very, a lot of不能修饰比较级。

这句话的意思是：乘飞机旅游比坐火车快多了。

far 在这里的意思是：到很大程度;很;极
可以修饰比较级。

many虽然后面可以更比较级，但是用在这里不够好。

4.C
Though the price of the camera is OK,
( yet )I don't think I'll take it.

Though 虽然不能和but一起用，但是yet可以，而且和but的意思一样。

5.A
The city is trying to ( improve )
the living environement of the people.

improve:改进,改善;增进

rise:(数量、程度等)增加,上涨

lift:举起;抬起(东西)

increase:（数量上的）增大;增加

1.B may翻译成可以
2.C mistake错误 可数名词，从意思上看用比较级，选fewer
3.。。。。。我觉得每对的，前面有though意为虽然，后面不应该在出现关联词，是不是打错提了？