To make us healthier, the teachers often see us ______ on the playground. 
#49764
A
took exercise
B
take exercise
C
take exercising
D
to take exercise
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The boy was seen            on the sports ground.
#50866
A
to play
B
play
C
played
D
to playing
Now I’m ________ my turn. 
#50482
A
wait for
B
waiting for
C
waiting
D
waiting to
Class is over. Let’s stop______ a rest.
#48819
A
having
B
to have
C
had
D
have