He is not tall ,so he sits in the front of the classroom.（在教室内部的前面要加THE）
You can choose this red one or the blue one,but not both of them..
There are few books in my bag ,are they?( few 表示否定）
Be quick ,or we will be late again.
The pens are made of metal.
The river is too wide and deep for us to swim in.
How soon will he return home ?in 2days.
Take a taxi ,and you won't miss the train .
The trip from the school to the museum took us 4hours.
Nobody taught me English,I taught myself English.
Be careful there is a lot of traffic on the city roads.
There are many places of interest in China.
There is a lovely house with many trees in the street .