What a mess! The sharing bikes are thrown everywhere.
Let's collect and put them in the right place_____they can be used conveniently.( )
A.unlessB.so thatC.becauseD.so long as
The water dark and dirty.It's no longer safe to drink.( )
became
has become
will become
was becoming
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