如题、 这句前面一句是when you by bus in HongKong ,you have to be caref

如题、 这句前面一句是when you by bus in HongKong ,you have to be careful ,too.You must always r____ the traffic moves on the left .SO you must be careful.Have a look first ,o_____ you will go the wrong way .
填空.还有 单词范围都是初二下学期的、、
麻烦 还有一句是。you must look to the right side and then the left b____ you cross the street.

第一空是填remember意思：是要记住车子在左边行驶.
第二空是填or 意思是：否则你会走错路.
第三空是填before 意思是,在你过马路前你要先看右边然后看左边.