It _____ last week that the haze(雾霾)in Beijing caused many problems.
Tony is a clever boy, ______ he usually fails in Chinese exams.
–Mr Johnson, we have found your watch. --My watch! Thank you. Where _____ it?
–Which is more important, Chinese or English? -- I think Chinese is ______ English. I like both of them.
There are _____ new words in the _____ lesson.
We are often told _____ at people in trouble.