David’sister often her pocket money on books and magazines．

（2014山东省实验中学高三第二次模拟考试）7．Perhaps it will never be known __________ he did with those materials on the incident．

My computer is __________smaller than ____________.

You’d better put away the magazines you have read, for they _______ be of great use later.

______, I think, and all the problems could be settled