用方框中所给单词的适当形式填空，每词限用一次。

one   during   safe   careful   dream

My _________is to be a dancer
Yan Liwen was called “China’s _________astronaut” when he returned to Earth.
If you read the passage more_________, you can understand the writer better.
Mike went to Hangzhou and met some friends _________ his winter holiday.
Many people prefer to travel by plane. They think a plane is faster and ______ than a train.