Scientists think that there has been life on Earth for _______ years.       

–Would you like to go to see the film with us?

--Sorry, I can’t. Because I ________ it twice.

–How long has Mr. Liu taught English?     --- _______ 1998.     

She hasn’t visited Thailand _______ England yet.      

It’s a lovely day, _________?

His mother is ill. He has to ________ her at home.

My father _______ at eight o’clock yesterday evening.     

The box is big, but you can carry it because there is _____ in it.

I live in the north of New York. One day last 31 when we received our first snow, I looked out and knew that I had to stay at home.

An hour later, I tried to go out to walk my dog. But to my  32, I found my sidewalk and path were cleaned. I had no idea 33  did this good deed（事情）. I looked over to my neighbor’s sidewalk. There stood the husband with also surprising looks on his face. I  34  him who did it. He also had no idea.

About a week later, we had another snow and I  35 to find the snow angel (天使). It was a good plan, but I got busy inside and  36 to keep a look out. When I remembered to look out, the sidewalk was 37  again.

Now I believe determined (堅決的) to find my snow angel. I asked everyone I knew in the neighborhood. I had 38  here for only three years and only knew some of them. So once again my snow angel got away.

I waited for the third snow. While I was reading I  39 some noise. Tears came to my eyes. I found my snow angel was an 8-year-old boy. He lives a few houses away from me, 40  he came here to clean my side-walk.

For a short time I know , he is an angel for everyone, not only for me.

Here is how to leave the supermarket with the things you wanted to buy and nothing more.

1.How many suggestions does the writer give us?

2.To buy things we use every day in the supermarket, we have to ______.

3.The most expensive things are placed in the ______ places.