Usually, we don`t know how important something is _____ we lose it.
A. or B. until C. as soon as
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 |
----_______ did you start studying English ? -----Five years ago.
| A．When | B．How long | C．How often | D．What |
The room was dark, _______ I turned on the lights.
| A．and | B．or | C．but | D．so |