can learn how to surf the Internet safely and effectively in computer lessons.

What’s the advantage of shopping online–I think buyers _______spend a lot of time going to shops.

___meet his sister at the railway station,he had to get up early.[ ]

___ difficult and challenging thetask may be, we must finish it on time, because there is a possibility _________we’llbe fired if we can’t fulfill the task on time．

To enjoy the scenery, Irene would rather spend long hours on the train _____ travel by air[ ]