1. It is essential that you do your homework before going to school.  You must ………………………………………………..….. 2. It is necessary for us to be present at the class discussion on Saturday.  We must ………………………………………………………… 3. Hanoi is large, Bangkok is large and Tokyo is the largest.  Tokyo is ……………………………………………………………… 4. It is wrong of us to throw rubbish..  We mustn’t ……………………………………………….……… 5. How many apples does she want?  How many apples would………………………………..? 6. Learning how to use a computer is very easy  It is ………………………….…………….…………………… 7. He drives very carefully.  He is ..………….…………………………………………… 8. Students at our school take part in a lot of outdoor activities  Students at our school do ……………….……………………………..……… 9. I find it difficult to find a better solution to that problem.  I have ........................................................................................................................... 10. Lan is the oldest of the three sisters  Lan has ............................................................................................................