John plays the piano _____, if not better than, David. But he never shows off in public.

I phoned you at 7 yesterday evening but nobody answered.— Oh, I ______ my dog in the park then

you have to plough the field anyway,you _____ as well plant crops at the same time.

This group of designers ________a plan for the project of the company.

A lot of fish in the river _______ recently, because there is lots of pollution.