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

In the opinion of Li Ming, a science student in that high school, physics is_______ chemistry, but much easier than English.

It’s a ________ clock, made of brass and dating from the nineteenth century.

The salesman showed her several MP3s and she chose ________ one as she didn't want to spend too much money on it.

 While intelligent people can often _____ the complex, a fool is more likely to complicate     the simple.