He is of medium build.
| A．not tall or short | B．thin or heavy |
| C．of medium height | D．not thin or heavy |
I spent five yuan on this pen. =" I" spent five yuan buying this pen.
| A．by | B．in | C．for | D．on |
Why don’t you come and have a look?
| A．Why don’t | B．Why not |
| C．Why about | D．What don’t |
Mike likes to watch the birds _________ in the sky.
| A．flys | B．flying |
| C．flies | D．fly |
I am not sure.
| A．always | B．still |
| C．never | D．yet |