The police examined the cars and allowed them to go ahead..

Go ahead, we are listening.

-------Would you mind me sing your pen?

-------Not at all. Go ahead.

　　7. by accident: as a result of chance or mishap;

He only found his dog lost a week ago by accident.

I took her umbrella by accident after the meeting.

　　8. stare: look with the eyes wide open in a fixed gaze in astonishment, fear.

He was staring out over the fields.

Just look at the beautiful presents.

We can gaze at something without looking at it if our eyes are not focused.

She spent hours gazing into(凝视) the distance.

The man in short sleeves stood outside their houses and glared at us.

　　9. spot: pick out one person or thing from many; discover; recognize.

He finally spotted just the shirt he wanted.

She spotted her friend in the crowd.

I can`t spot out the difference between them.

Which has spots, the leopard(豹子) or the tiger?

She had sots on her face when she was ill.

　　10. account for: be the explanation of sth. explain the cause of sth.

His illness accounts for his absence. 他因病缺席.

Please account for your own conduct. 请对你自己的行为做出解释.

　　11. on the contrary: the opposite is true; not at all

It doesn`t seem ugly to me; on the contrary, I think it is rather beautiful.

　　Step 5 Using words, expressions and patterns

　　Turn to page 56 and do the exercise 1 and 2.

　　Step 6 Homework

　　1. Finish off the Workbook exercises.

　　2. Learn the new words and expressions by heart.