1.            Điền động từ thuyết thiếu “mustn’t”, “don’t have to” vào chỗ trống

              1.1.        You…………don’t have to……..pick me up tomorrow. I will take a taxi.

              1.2.        Look at that sign! You…………mustn’t……..walk on the grass.

              1.3.        You…………don’t have to……..blame anyone for your mistakes. You need to be responsible for yourself.

              1.4.        You………mustn’t………..be absent from class tomorrow because the teacher will check your attendance.

              1.5.        I…………don’t have to……..prepare dinner because we will eat out tonight.

              1.6.        You………mustn’t………..leave any rubbish here. It is forbidden.