In that school, German is compulsory for all students, but English and French are （ ）. 

After the party, we had to tidy up the kitchen, which was a(n)（ ）mess.

Do you think climbing is （ ） to our health？ 

It was so late that we（ ）had time to catch the train.

There are（ ）fewer custom tailors and dressmakers in the U. S. than in European countries.

There is a/an （ ） increase in the numbers of Internet users in recent years. 

The train （ ） to arrive at 11: 30, but it was an hour late.

The couch is comfortable to（ ）.

He had his bicycle（ ）yesterday.

Have you heard the 2022 Winter Olympics（ ）in Beijing?

Women employees（ ）the same salaries as men for doing the same work.

The case（ ）by a three-member unofficial commission headed by Justice Kretzer.

No harm （ ） your health if you dream a little when you are sleeping.

Since you feel so strongly about this matter, you should make your views（ ）to other committee members.

Paper（ ）first（ ） about two thousands years ago by Cai Lun. 

As far as I know, the robot that can sweep the floor（ ）in the 1980s.

The house, （ ）was completed in 1856, was famous for its huge marble staircase.

Perhaps the days will come（ ）people will be able to breathe clean air in cities.

He said that he didn’t know （ ） to deal with the matter, so I left. 

Children are excited about the approach of Christmas, （ ） may bring great happiness to them.