___________ is known to everyone, the moon travels round the earth once every month.
A. It B. As
C. That D. What
Taking exercise is the key ______ your health.
A. to improve B. to improving
C. in improving D. of improving
One can always manage to do more things, no matter__________full one’s schedule is in life.
A. how B. what
C. when D. where
Convenient ______ plastic bags are for people, they will cause white pollution.
A. as B. although
C. since D. while
______ no bus, we had to walk home.
A. There was B. There being
C. Because there being D. There were
Only after the incident happened was I conscious ______ his unfriendliness.
A. with B. for
C. of D. at
