New Words：

quantity [ˈkwɒntəti] n. 量；数量
a quantity of 大量的;一些;许多
quantities of 大量的;一些;许多

Sample Sentences：

A quantity of food was on the table.
There is a small quantity of water left in the bottle.
They needed large quantities of wood for building houses.
They spent quantities of money on building a huge bridge.

New Words：

drug [drʌɡ] n.药物；毒品

Sample Sentences：

The drug has some bad side effects.
Few teenagers in our city use drugs.
This drug is used to lower blood pressure.
The police found a quantity of drugs at his home.

effect [ɪˈfekt] n. 影响；作用；效果；效应
quantity [ˈkwɒntəti] n. 量；数量
a quantity of 大量的;一些;许多
quantities of 大量的;一些;许多

New Words：

recognize [ˈrekəɡnaɪz] vt. 认出;意识到

Sample Sentences：

I recognized her by her red hair.
I recognized that I had made a mistake.
Drugs were not recognized as a problem then.
I recognized him as soon as he came in the room.

drug [drʌɡ] n.药物；毒品

New Words：

sight [saɪt] n. 视力；情景；视域；风景

Sample Sentences：

She has very good sight.
Get out of my sight!(= Go away!)
He has very little sight in his right eye.
She never lets her daughter out of her sight.
After ten days at sea, we had our first sight of land.
We're going to Paris for the weekend to see the sights.
It was love at first sight(= We fell in love the first time we saw each other) .

New Words：

trouble [ˈtrʌbl]
n.困难;烦恼;麻烦;问题
v.麻烦;使忧虑;使烦恼

Sample Sentences：

My car's got engine trouble.
If I don't get this finished in time, I'll be in trouble .
Don't mention my name or you'll get me into trouble.

Losing a little money doesn't trouble me.
Sorry to trouble you, but could you tell me the time?
I'm sorry to trouble you, but I wondered if we could have a word some time.