I think swimming is ______ hiking.

The other day，my brother drove his car down the street at________I thought was a dangerous speed

Did you watch I am a singer last night? —-No, there was something wrong with my TV. It couldn’t _______ any programmes.

Some people hold the view that the new machine isadvanced, while others are still skeptical _____ whether it is of practicaluse.

We are so lucky to have so many caring teachers.—Yes, they are really lovely. I am thankful them what they have done for me.