Vocabulary （本题共5小题，每小题1分，共5分）
Complete the sentences with proper forms of the words given.
The__________(five) room on the left is a reading room.
He had his computer__________(fix) shortly after it broken down.
_________(luck), we have no enough time to prepare for the exam.
Some old people say the life they are used to________(change) a lot in the past few years.
If there are fewer people driving, there will less air___________(pollute)