Why are there a lot of dead fish in the river?－Because they were ______ by the polluted water.

_______is it from here to your home? —20 minutes on foot.[ ]

______ do you like the trip to Wuhan?－It’s wonderful.

Kangkang, how many apples are there _____ the tree? —Too many. [ ]

He is _______ clever boy that he can solve _____ many difficult problems.