______ Kathy was watching TV, her mother asked her to go shopping.
| A．Before | B．Until | C．While | D．After |
The Yellow River is one of ________________in the world.
| A．the longest river | B．the longest rivers |
| C．the long river | D．long rivers |
---Why not_____ us ?
----Because I have a lot of work______.
| A．to play; to do | B．play; to make |
| C．playing with; doing | D．play with; to do |
He____25 yuan buying this new book yesterday afternoon.
| A．spent | B．cost | C．took | D．paid |
It’s time for supper now. Let’sit.
| A．stop having | B．stop to have |
| C．to stop to have | D．stopping to have |
----______have you been learning to swim ? ----Half a year.
| A．How long | B．How often | C．How far | D．When |