1.it`s a good idea to do exercise regularly. 

=>you.........................................................

2.my father finds playing board games interesting.

=>my father is .......................................................

3.he hasn`t smoked cigarettes for a month.

=>the last time............................................

4.that apartmen is more modern than any apartments.

=>that apartment..........................................................

5.there are over two hundred stamps in Nam`s collection.

=> Nam`s collection...........................................................

6.I spend twenty minutes walking to school every morning.

=>it takes.............................................................................

7.I find losing weight verry difficult.

=>it`s.............................................