6,She bought some tulips yesterday

Some tulips........were bought yesterday..........

7,He usually washes his car ecvery Sunday morning

His car........is usually washed every Sunday morning............

8,Somebody cleans the room everyday

The room.........is cleaned everyday.....

9.They cancelled all the flights because of fog

All the flights........were cancelled because of fog............

10.People do not use this road very often

This road.........isn't used very often..................