viết lại câu sử dụng mệnh đề quan hệ :
1.my father lives in a small house full of ornaments . This makes it really difficult to learn.
➜my father
2.some students take a year out before university . This allows them to work or travel.
➝some students
3 the Guggenheim Museum is in BillBao.It only displays contemporary art .
➜
4 the lecture was about current economic policy.It was not easy to understand
➜the lecture
5. In 1990 my parent arrived in New York . They stayed there for the rest of their lives
➜my parents arrived in New York