Put the verbs into the passive to complete the sentences​

1. Every home has windows and doors installed to move in and out and for ventilation purpose.

2. Materials for the window frame could be wood or metal with the pane made of thick glass.

3. Small window openings were sealed with primitive wooden shutters that provided protection against rain, heat, cold and insects.

4. Louvered wooden shutters provided insulation and light control, and when pointed downward they could repel rainwater.

5. A spacer is the component used in window manufacturing that separates the two panes of glass in an insulating glass system.

6. One of the benefits of plastic windows is very little maintenance that the frames require.

7. Plastic windows are a cost effective alternative to expensive wood windows.

8. If glass sandwich is broken, glass fragments don't smash in all directions but remain on the flexible layer.

9. Insulated glazing unit is flooded with mastic to prevent penetration of dust and moisture.

10. In England glass was used in the windows of ordinary homes only in the early 17th century.

2. Perhaps Catherine missed the bus - Perhaps Catherine could have missed the bus.

3. I'm sure Emma knew it was my birthday - I'm sure Emma must have known it was my birthday.

4. I'm sure Oliver didn't get the invitation - I'm sure Oliver can't have got the invitation.

5. I'm sure Matt went to the doctor's - I'm sure Matt must have gone to the doctor's.

6. I'm sure Richard didn't have a basketball match - I'm sure Richard can't have had a basketball match.

7. Perhaps Karen's car broke down - Perhaps Karen's car could broken down.