根据句意及图片的提示，补全单词。

        1题                      2题                    3题                4题                     5题

1. We have known that the hand-held ____was invented in 1971.

2. The____ sneakers that were invented by Julie Thompson are used for seeing in the dark.

3. I used three      of flour and one of sugar.

4. The light ____ gives people more time to work and play every day.

5. In summer, many students really like wearing____ at home.