I don’t know ______ with this problem. It’s too hard.
| A．which to do | B．when to do |
| C．what to do | D．how to do |
---- Don’t play with fire. ----- __________________.
| A．Never mind. | B．You’re welcome. |
| C．That’s all right. | D．All right. |
Last week, Sam wrote to _____________ boy to tell his life in the middle school.
| A．a five- year-old | B．a five years old |
| C．a five-years-old | D．a five year old |
I can enjoy the moon ___________ the window every night.
| A．over | B．under |
| C．across | D．through |
---Your bedroom is so dirty. Would you please _______, Peter?
---OK, mum. I’ll do it right away.
| A．set it up | B．put it on |
| C．pick it up | D．clean it up |
Look! There are so many ________ on the farm.
| A．sheep | B．horse |
| C．chicken | D．cow |