（1）Yesterday was ______.
A.Saturday
B.Sunday
C.Friday
（2）The writer and his classmates got to the park _______ .
A.by bus
B.on foot
C.by bike
（3）Some children were _______ when they got to the park.
A.watering the trees
B.planting the trees
C.climbing the trees
（4）The writer didn't _______ at the park.
A.pick up the rubbish
B.fly a kite
C.clean the public walls
（5）The world will be _______ if everyone protects the environment.
A.much dirtier
B.more and more crowded
C.more and more beautiful