(2013·山东潍坊高三联考)The scientist won the Nobel Prize in Chemistry, ________ made him famous all over the world.

The flower is very beautiful, it smells pleasant.

My sister______two hours writing the article yesterday.

It is required that students _____mobile phones at school, so seldom _____them using one.

This printer is of good quality. If it _____break down within the first year, we should repair it at our expense. [ ]