Mary is often heard ________ playing piano in the next room in the evening.
#97118
A
practise
B
to practise
C
practising
D
practiced
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_________ computer games made his mother worried. 
#91956
A
That the child was addicted to play
B
The child’s being addicted to playing
C
The child’s being addicted to play
D
What the child addicted to playing
In order to make our city green,______.
#98146
A
it is necessary to have planted more trees
B
many more trees need to plant
C
our city needs more trees
D
we must plant more trees