____new wave of Chinese migration is under way, fuelled by ever-younger students for whom English is not a piece of knowledge but a living language to unlock ____ door of the wider world.
---- If__________, some terrible diseases would spread in the stricken-areas after the
terrible earthquake in Wenchuan, Sichuan Province.
----So people there were in______ need of medical teams.
---- What about going out this evening?
----Oh, I don’t know. I’ve got a bit of a headache. And, __________ ,John’s coming to see me, so I ought to stay in.