Hoàn thành câu :
1 . hoa/ have/ math/ three times/ a week .
=> Hoa has Maths three times a week.
2. we /receive/ report /ago.
=> We received the report a week ago / a year ago.
3 . his mother/ very sad /he/ study /badly every semester.
=> His mother was very sad because he sudied badly ever semester.
4.we/ going /clean /lakes ' banks/ weekend
=> We are going to clean lakes' banks at the weekend.