1. They lost their way in the forest, and _______ made matters worse was that night began to fall.
A. it B. which
C. that D. what
2. Patience is a kind of quality and that is ______ it takes to do anything well.
A. what B. which
C. which D. how
3. It has come to my notice _______ some of you have missed classes.
A. what B. which
C. that D. when
4. What were you trying to prove to the police? ___ I was last night.
A. That B. When
C. Where D. What
5. Country life gives him peace and quiet, which is ______ he cant enjoy while living in big cities.
A. that B. why
C. where D. what
6. It is pretty well understood _______ controls the flow of carbon dioxide in and out the atmosphere today.
A. that B. when
C. what D. how
7. _______ she couldnt understand was ______ fewer and fewer students showed interest in her lessons.
