If there are ______ trees, the air in our city will be _______ cleaner.
A．less, more B．more, more
C．more, much D．much, more
You shouldn't ____ the boy's mistakes．
A．laugh at B．smile C．laugh D．laugh down
______our teacher is ill, ______ he still comes to our class to teach us.
A. Though; but B. Though; /
C. Although; but D. But though
The teacher said that the earth ______ around the sun.
A. moves B. move C. moved D. had moved
I felt it hard to keep up with my classmates. But whenever I want to__ __ ，my teacher always encourages me to work harder.
A. go on B. run away
C. give up D. give back
_________great weather it is today!
A. How B. How a C. What D. What a
