$\text{I. Combine the following sentences using Relative Clauses:}$
`1.` Mr. Nam, who will teach our class this year, is a new graduate.
`2.` Many diseases which people died of many years ago are no longer dangerous.
`3.` The hill which housed a big forest only two years ago is treeless now.
`4.` This is a rare opportunity that you should take advantage of to get a better job.
`5.` The girl who had been punished by her supervisor cried a lot.
`6.` This matter which you should pay attention to is of great importance.
`7.` I will introduce you to the man whose support is necessary for your project.
`8.` The best place where you should put the piano is in the living room.
`9.` The examination which I was successful in lasted two days.
`10.` This is the ideal place where we can build a house of our own.