10.We must tell him this story when he comes back.

9.The Soviet Union is the biggest country in the world.

8.It is not easy to correct all our mistakes.(To correct all our mistakes is not easy.)

7.He is stronger than I(I am).

6.Many foreign friends are(were,have been)invited to see the new film.

5.My brother graduated from middle school two years ago.

4.We shall begin to work next Monday.(或begin working;或用start)

3.He has not heard that report.

2.The factory opens at 8 o'clock in the morning.