Travelling west, you set your clock ______; travelling east, you set it ahead.

 He absorbed himself so entirely to his research that ____he made himself ill.

— Oh, really? Can Doris read through it in such a short time?— She covered the English novel ______ it took me, still less a simple story．

--People should use public transport instead of their own private cars.--- _______.The roads are too crowded as it is.

As their memories decline, some old people tend to be talkative because they ______ forget what has just been said.