________ he still paused uncertain, he became aware that the driver was looking closely in from the street at this unusual scene.
| A．While | B．As | C．Since | D．Because |
—We need to buy some summer clothes, John.
—Oh, I never know ________when I'm in the store.
| A．what clothes should buy |
| B．what clothes to buy |
| C．what clothes will buy |
| D．to buy what clothes |
—Isn't Miss Brown here yet?
—No.________， she's not here yet.
| A．To my much surprise |
| B．Surprising me |
| C．Much to my surprise |
| D．Surprisedly |
The temperature is high enough ________water into vapor(蒸汽)．
| A．to be changed |
| B．changing |
| C．to change |
| D．changed |
There is no good for the parents to provide everything________their children.
| A．with |
| B．for |
| C．to |
| D．by |
Wait until you are________in.
| A．permitting to come |
| B．permitted to come |
| C．permitted coming |
| D．permitting coming |