Exercise 6
The following sentences are taken from Understanding Integrated Science for the
21
st
Century Book 1A published by Aristo Educational Press Limited.
Fill in the blanks with the correct form of the verbs in brackets.
e.g. Were vitamins discovered long time ago? (discover)
1. Radio signals ____________ by Titanic asking for help.(send)
2. The Bunsen burner ________ first ___________by a British physicist and chemist
called Michael Faraday in the early 19
th
century. It___________ then
____________by a famous German chemist called Robert Bunsen in 1850.
(invent, improve)
3. The earliest scale for measuring temperature ____________
by a Dutchman
named Gabrief Fahrenheit in the early 1700s. (invent)
4. During the construction of the new airport at Chek Lap Kok,
a huge area of the
sea ___________ into land. (turn)
5. Microscopes _____________ by Hans and Zacharias Janssen in 1590. (invent)
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