It’s my ruler.

If you have finished your homework, you could _____ cleaning and cooking.[ ]

I went to your house yesterday afternoon, but you were not in.— Sorry. I _______ basketball with my classmates.

My uncle has worked the farm twenty years ago.[ ]

It’s quite a time _____ Liu Xiang was injured in the foot, but we are sure it won’t be long _____ he returns to the track.