如果生活在受污染的环境中,人们很容易生病。(fall)Living in a polluted environment, people may ___ ___ easily.
If he had spent more time practising speaking English before, he ________ able to speak it much better now.
If we ________ a table earlier, we wouldn't be standing here in a queue.
—Where ________ Mary have put the empty bottles? —She ________ them away. They must be somewhere.
Some young people these days just ________ go out of their homes to contact the real world.
—Who ________ be phoning us at this time of night? —It might be your sister.