Scientists believe that the smart home may be the home of the future. Smart homes may be of different shapes and sizes.

Scientists have designed an eco houseboat (7) _______ is a kind of house floating on the sea. However, (8) _________ houseboat is stable and doesn't rock heavily when there are big waves. It makes use of waves and solar energy to move around and provide power. It also has solar panels (9) _________ the top of the house to  generate electricity, and it can recycle (10) ________ kinds of household waste.

A robot controls everything in the house and does the housework. In the kitchen, smart refrigerators and dishwashers can automatically work by themselves. A smart oven can cook your favourite dishes. All these things and other (11) __________ will make our life much better.

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct word that best fits each of the numbered blanks

Scientists have designed an eco houseboat (7) _______ is a kind of house floating on the sea.