Eighty percent of the students in this school______three to five times a week.( )
exercises.
exercise
exercising
Last night,the shop was closed she didn't buy any chocolate.( )
so
if
or
when
Some old people need a _______ because they feel lonely.( )
gift
stick
pet
watch
By the time the teacher came, we ______ cleaning the classroom.( )
finished
have finished
had finished
_____ walk on the grass.( )
Doesn't
Don't
Not
The coat looks very nice. Can I _____?( )
try it on
try on it
try them on