If there are ____trees, the air in our city will be ____cleaner.
----Who swept the classroom?---- I_________.
----Excuse me, look at the sign NO SMOKING.----Sorry. I ______ it.
Li Lei knows two foreign languages. He can speak _______ English______ French.
The dictionary ________ me more than 100 yuan.
--- Can you hear a girl ______ in the room?--- Yes. let’s go to see her.