Only when he reached the teahouse ________ it was the same place he'd been in last year.(2011·全国Ⅰ)
Coal was formed out of dead forests by chemical ______ .
He is trying hard to feed and ____ his family.
They say that ____Chinese language is particularly difficult for ____ European.
It remains ______ whether he will pass the exam this time.
Spain will be terribly hot in August and _______ we can’t afford a holiday abroad.