Read the following passage and mark A, B, C, or D to indicate the correct answer to each of the blanks.

          Everyone needs a home where they feel sheltered and safe. Today we live in modern flats and houses, (36) ___________ have air-conditioning to keep us cool, and heating to keep us warm. There is electricity for lighting and supplies of gas or oil for the heating. Hot and cold water (37) ___________ from the taps and dirty water disappears (38) ___________ the drains. Many of our homes have balconies or gardens. In the past, people made their homes from materials that they found nearby. When we look at different houses we can tell how old they are from the materials used and the way they were built. It was different long (39) ___________ people did not have water in their homes and there were no electric lights. To keep warm, they sometimes made (40) ___________ inside their homes. With a fire started they could cook their food and heat water.

Điền vào số (40)