How about the pollution in the countryside?－Luckily, it’s not as serious as _______ in the big cities.

The story ______ I read the newspaper was about a common problem among teenagers.

He began to learn the accordion at the age offour.(选出与画线部分意思相同的选项)[ ]

Only_______ of the students_______ passed the English exam.

Which do you like , summer or winter?—I prefer summer.