The reason ______ most Chinese have healthy white teeth is ______ they eat a healthy diet.

In such hot weather, the new plant will have to be protected from the sun if they ______.

In the police station, I saw the man from ______room the thief had stolen the TV set.

Martin Van Buren was the eighth president of the United States and the first ______native language was not English but Dutch.

We are going to spend the Spring Festival in Guangzhou, ______ my parents and some relatives.

Safety in school has been of great concern (关注) because of recent reports about accidents _____ students got injured or killed at school.

It was an exciting moment for these fans this year, _____ for the first time in years they saw their favorite singers.

We climbed to the top of the hill, ________．

Look out! Don’t get close to the house, ______ the roof is under repair．

— It is very cold these days.
— ______.