I am sorry to hear that you are worried about the variety of English you have been learning.

    Firstly, the differences between British and American English may surprise those{#blank#}1{#/blank#}have learned English for years.There{#blank#}2{#/blank#}(be) almost no differences in grammar and only a few differences in vocabulary.British and American people have no difficulty{#blank#}3{#/blank#}(understand) each other.They watch films and televisions from each other's countries for{#blank#}4{#/blank#}(please).

    Secondly, there isn't only one British{#blank#}5{#/blank#}American English.For example,all major cities in the UK have{#blank#}6{#/blank#} (they) own dialects with different accents from each other.Sometimes these accents can be{#blank#}7{#/blank#}(hard) to understand for even a British person than some Americans.Also,there are Englishes from many other countries.People who speak these Englishes usually also manage{#blank#}8{#/blank#}(communicate) with other English speakers without any problems.

    All learners need to be able to understand English spoken and written by as many people as possible and they need to be able to speak English so that as many people as possible can understand them.You should concentrate on this goal,not on{#blank#}9{#/blank#}to speak “British” or “American” English.

    I hope this is{#blank#}10{#/blank#}(help).

    With the{#blank#}1{#/blank#} (develop) of industry, air pollution is getting more and more serious. In Beijing, many people suffer different kinds of illnesses because {#blank#}2{#/blank#}air pollution. Air pollution is caused by the following {#blank#}3{#/blank#}(reason): about half of the problem is caused by vehicles. There are more and more cars, buses on the roads, and they give off {#blank#}4{#/blank#}(poison) gases. 25% of air pollution is caused by factories. Another factor is the smokers. Smoking not only does harm to their health {#blank#}5{#/blank#}to others. {#blank#}6{#/blank#}these, about 10%of air pollution is caused by other reasons. We should take some measures to fight {#blank#}7{#/blank#}pollution. New fuel can be used to take {#blank#}8{#/blank#} place of gas. We can plant more trees. If everybody realizes the{#blank#}9{#/blank#}(important) of environment and does something to stop pollution, the problem will {#blank#}10{#/blank#}(solve).

    No one knows exactly {#blank#}1{#/blank#} the earth began. However, according to a widely accepted theory, the universe began {#blank#}2{#/blank#} a "Big Bang". Then the dust {#blank#}3{#/blank#}(settle) into a solid globe. As the earth cooled down, water began to appear on its surface. Many {#blank#}4{#/blank#}(science) believe that it was the presence of water that allowed the earth to dissolve {#blank#}5{#/blank#}(harm) gases and acids into oceans and seas, which made it possible for life to develop.

    Millions of years later, the first small plants appeared on the surface of the water. Their development {#blank#}6{#/blank#}(follow) by early shellfish, all sorts of fish, green plants and land animals. Reptiles {#blank#}7{#/blank#}(produce) young generally by laying eggs while mammals gave birth to young baby animals. Dinosaurs existed on the earth for over 140 million years before they suddenly disappeared. The reason {#blank#}8{#/blank#} they disappeared still remains a mystery.

    Finally, humans appeared and spread all over the earth. But they are putting too much carbon dioxide into the atmosphere, which prevents heat from {#blank#}9{#/blank#}(escape) from the earth into space. As a result of this, people believe the earth may become too hot to live on. So {#blank#}10{#/blank#} life will continue on the earth will depend on how this problem can be solved.