John hadn’t been able to stop smoking suddenly;he had to control his smoking desire ________.

A.by and by                  B.sooner or later           C.little by little             D.from time to time

We all do more speaking _______，even when we have a break after class.?

A. now and then B. by and by?

C. step by step D. more or less?

–Julia has moved to a nuring home recently ?

--oh , really? I _____know. I _____go and visit him by and by.

     Mike had been delivering (送) newspaper for a week, but he was still not quite sure   36   he was going to like his first job. Today he was to   37   the month's money from his customers (顾客). At the first house, Mike walked past the Pierces' barking dog,   38   was tied up in the front yard. When he    39    the door he got up enough   40    to ring the bell. He told the man what he   41   . Mr Pierce didn't smile or say anything , but he handed Mike a bill. Mike   42   counted out the man's change.

 43   the time he got to the   44   house, Mike felt a little more  at ease. Mr Simon was repairing his   45   . He, too, gave Mike a   46   . but he smiled and talked    47    Mike gave him his   48   .

As Mike walked to the third house, he   49   a bit uneasy, Mr Swenson was just    50     home from the store, and he stopped   51   he saw  Mike. Mr Swenson paid Mike the exact amount in change. They stood   52   in front of the house   53   . This wasn't   54   to be such a difficult job    55    , thought Mike as he continued on his way.

　　Forests have always been useful and important to man who makes use of them in many ways. Every day trees are serving man everywhere. Trees supply man with fruits and building materials in the form of wood. Without trees it would be impossible to build houses, boats, bridges and so on. Furniture such as desks, chairs and beds is made of wood. Trees can stop man from terrible heat. They're also useful in preventing good and rich top soil from being washed away during heavy rains.

　　If there were no trees, heavy rains would wash away the rich top soil that is so important to plants. The result is that the land will become a desert. There are plenty of desert areas in the world. A long time ago these desert areas used to be very rich areas, but man in the past had no enough knowledge about science of nature, they cut down too many trees in the area where they lived and never planted new ones. By and by the rich top soil was blown and washed away by strong winds and heavy rains. In the end the rich land changed into useless deserts where nothing could grow.

According to the passage, ______.

　　　　A. a long time ago, man didn't know how to make use of wood

　　　　B. trees are not as useful as they were in the past

　　　　C. trees were more found in the past than they are today

　　　　D. people have always found trees useful

　　If there were no trees, ______.

　　　　A. the land would become better　　　　B. heavy rains would be very clean

　　　　C. the rich soil couldn't be kept　　　　 D. there wouldn't be any plants

　From the passage, we know that man must ______.

　　　　A. do nothing to keep the balance（平衡）of nature

　　　　B. take his best to keep the balance of nature

　　　　C. try his best to keep the balance of nature

　　　　D. do his best to stop the balance of nature