The water froze inside the pipe，causing it to ________and burst.
| A．expand | B．export | C．reduce | D．behave |
The newcomer went to the library the other day and searched for ________ he could find about Mark Twain.
| A．wherever | B．whatever | C．however | D．whichever |
One of the rules is that every student ________ wear school uniform while at school.
| A．might | B．could | C．will | D．shall |
Tom took a taxi to the airport, only ________ his plane high up in the sky.
| A．finding | B．being found | C．to find | D．to have found |
Before driving into the city, you are required to get your car ________.
| A．washed | B．wash | C．washing | D．to wash |
I looked up and noticed a snake ________ its way up the tree to catch its breakfast.
| A．to wind | B．winding | C．wind | D．wound |