________ her leg the last time, Brenda decided not to go on the school skiing trip this year.
| A．Breaking | B．Broken |
| C．To break | D．Having broken |
----_____is it that is troubling Mary ?
----Working out the maths problem..
| A．What | B．How | C．Why | D．Which |
I wonder how long it will take you_____ such a hard task within so little time.
| A．complete | B．to complete | C．completing | D．completed |
Tom was absent from school this morning, because sometimes he was a little weak and could ______ill .
| A．take | B．set | C．catch | D．fall |
. Will you pass me the dictionary _____ the cover is dark blue?
| A．its | B．which | C．whose | D．of which |
_____the girl could rush out of the house, the roof fell upon her.
| A．When | B．While | C．Before | D．As |