What is the best way you think of ______ the environment?
#51117
A
to protect
B
protecting
C
protect
D
protected
推荐题目
How long do you often spend _______ this book , boys?
#49038
A
reads
B
to be read
C
to reading
D
reading
My parents told me try ______on Christmas Eve because Santa Clause may come and send me some gifts.
#50171
A
not to sleep
B
don't sleep
C
not sleep
D
to not sleep
Sarah always makes her son ________ his hands before eating.
#51166
A
wash
B
washed
C
washing
D
to wash
— Dad, why should I stop ______ computer games?— For your health, my boy, I’m afraid you ______.
#48437
A
to play; must
B
playing; have to
C
to play; can
D
playing; may