Scientific research shows that animals can showemotions like human beings. They are sometimes lively, and sometimes bad-tempered.

It is reported thrather ourcountry __________ one by ourselves.

Both red and black represent _____ . But I prefer to wear red when I feel tired .

smoke here–Sorry, we don’t allow __________ here.

are you busy with—The conference _____in our city next week,as you know.