Hikingby oneself can be fun and good for health. It may also be good forbuilding.

The 3G cell-phone must be of great use to ______ wants to get the information through the Internet quickly.

I ________ use a clock to wake me up because at six o’clock each morning the train comes by my house.

To turn off my cell phone before going to bed seems to be a rule . [ ]

Why don’t you bring_____ to his attention that you are too busy to do it?[ ]