___________ is known to everyone, the moon travels round the earth once every month.
A.It B.As
C.That D.What
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
. As a result of destroying the forests, a large ___ _ of desert
___ covered the land.
A.number; has B.quantity; has C.number; have D.quantity; have
____________ I came, the city wasn't so beautiful．
A.The first time B.At the first time
C.The first when D.For the first time
Our English teacher often creates an environment ________we are given the opportunity to practice spoken English.
A.when B.which
C.where D.that
