1/ he was ill, so he didn't go to school ( mình sửa đề câu 1)
( because of) -> Because of his illness, he didn't go to school
2/ The library stays open until 7 o'clock
(close) -> The library closes at 7 o'clock
3/ You will get a rise in salary after six months
( raised) -> After six months, your salary will be raised
@linhhuong