If all the plants on the earth die, _______ people _________animals will be able to live.
The meat is ___ dear and eating____ meat is bad for your health .
May I ask you ________ questions?
----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.