6, Lan(thang) is the most intelligent person/student in my class.
7, The water wasn't warm enough for the children to swim in.
8, Mr.Hoa advised Thuy not to lend that man any more money.
9, A new school will be built in this village ( by them).
10, Hien has learnt/learned English for 5 years. 
11, Long used to follow her mother to the zoo when she was a girl.