When people———, they produce less trash and help save natural resources.

Many travelers enjoy taking pictures of funny road signs while traveling. It istheir favorite ____________.

The purpose of the flying-car sign is to warn drivers not to ____________ the cliff.

You can put your road sign photos in your travel ____________ and ______ them with your friends.

The society as a whole operates on the basis of ———— schedules.

They would have been annoyed and wouldn't have waited that for more than———————————————— .

People from other cultures have a different understanding of—————————————— .

When Americans plan an event, they usually set the time days, a week or evena month ____________.

Americans are ———— about time.

The author writes this letter to ____________.

A. express gratitude
B. say hello
C. inform some news
D. invite his / her friend to attend a ceremony