Being examined twice a year，whether it is a car or a bus or a truck，is the rule that every driver _______obey in this city.

(2013·高考辽宁卷)He was unhappy when he sold his guitar.After all，he ________it for a very long time

The teacher came in, ______ a smile ______ his face.

I have bought a cup him. You don’t have to provide him bottled water. After all, plastic is harmful to the environment.

Let’s sing a song, ______ we?