rovinces have been hit with smog. If _______ unsolved, the problem may lead to more serious results.

Sorry, I’m late.— That’s OK. I ___________ long.

.—What are you reading，Jim—I’m not really reading，just________the pages.

Is Richard still living here—No,he to Paris already.

______ pressure the US government put on the Chinese government, China would stick to its own policy of exchange rate