—At present, one of the best ways to study is working in groups.—More chances ___________ to students to learn from each other.
This weekend our class will go to a mountain near our city_________ trees.( )
plant
planted
to plant
planting
Hi,madam.Can I take the story books out?
No,my boy.They _______be taken out of the reading﹣room.It's a rule.( )
mustn't
needn't
couldn't
wouldn't
Mom,could I watch the game show now?
Sorry,you can't watch it ________ you clean your room.( )
when
if
after
until
Look,the light is still on in Helen's office.
Maybe she_________ her work yet.( )
doesn't finish
won't finish
hasn't finished
didn't finish
If more people give up driving cars,the air will get much in a few years.( )
clean
cleaner
the cleaner
the cleanest