1. My secretary (sit) sat at the different desk today.
2. Our present boss (work) will work worke in this company all of his life.
3. Up the present, George (do) ..... good work in this class.
4. So far, you ( make) have made no mistakes on this exercise.
học tốt, câu 3 mik chưa lm đc, bn thông cảm