________ the class done most of the work? — Yes, but the rest ___________ rather difficult

I am very because I don’t like exercise.

______ there is no water left on the earth —I really don’t know.

Thefactoryproducedalargeamountoffurniturelastyear,sofar65percentofwhich_____exportedtosomeEuropeancountries. [ ]

The young pianist is very excited because the concert given by him has never been ________.[ ]