BÀI 1 Sắp xếp và thêm từ để thành câu hoàn chỉnh
1 It/difficult/slove/that problem/so.
=> It is so difficult to solve that problem.
2His house/buy/since/last year.
=> His house has been bought since last year.
3My mother/glad/that/I/always/get/good marks.
=> My mother is glad that I always get good marks.