下列每个句子均有一个错误，请找出并改正。（注意：每句只有一个错误。）
【小题1】There are a pen and two books on the desk.
【小题2】Two third of the people were badly injured during the earthquake.
【小题3】At last, the Mekong enters into the South China Sea.
【小题4】Amy is the only one of the girls who come from France.
【小题5】By the end of last year, we have learnt 3,000 words.
【小题6】You won’t find difficult to solve the problems.
【小题7】You can borrow so many books as you want.
【小题8】Mice ran out of the fields looked for places to hide.
【小题9】I prefer to watch TV rather than reading a boring book.
【小题10】I’m eighteen years old and I live in small village.