A. (1) We can imagine the beautiful surroundings. (2) There are many trees along the streets. (3) There is a clean river in the city. (4) There are many fishes in the river. (5) There are willow trees on the one side. (6) There are some pieces of grassland on the other side. (7) There are many flowers on them.

　　B. (1) Just imagine the beautiful surroundings if we have made our cities greener. (2) Green trees line the streets. (3) A clean river winds through the city, in which a lot of fishes abound. (4) On the one side stand rows of willow trees. (5) On the other side lies a stretch of grassland sprinkled with many yellow and red flowers.

　　1. There be...

　　1) a. There are fewer and fewer citizens who like to see films.

　　b. Films are now losing their appeal for many citizens.

　　2) a. There are many people who complain of severe housing shortages.

　　b. Housing shortages become the source of great complaint.

　　2. If

　　1) a. If you compare the two methods carefully, you will find the difference.

　　b. Careful comparison of the two methods will show you the difference.

　　2) a. If we only apply book knowledge, we will not get good result.

　　b. The application of book knowledge alone will not bring you good result.

　　3) a. If there is no pollution, man can certainly survive.

　　b. Man can certainly survive in the world where there is no pollution.

　　3. In order to

　　1) a. In order to prevent the problem becoming too serious to solve, we must take an immediate step.

　　b. An immediate step must be taken before the problem becomes too serious to solve.

　　2) a. In order to build a stable and prosperous nation, people should make new efforts.