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11 Complete the exercises.

A Complete the sentences. Change each question in parentheses to a noun clause. Add a
period (.) or question mark (?) to each sentence.

1. Is it true that people cooked over open fires in prehistoric times?

(Did people cook over open fires in prehistoric times?)
2. Do you know
(Were the first cast-iron stoves built by the French?)

3. Do you know
(How did people cook in China before cast-iron stoves were invented?)

4. I’m not sure
(Where was the first wood-burning stove invented?)

5. Ihave no idea
(When were gas stoves invented?)

6. Can you tell me
(What country was the gas stove invented in?)

7. I’m not certain
(Did people in America use ovens shaped like beehives?)

8. I wonder
(Did people cook first with gas or electricity?)

9. Do you have any idea
(When did people start using microwaves in their homes?)

10. Do you know
(Where did people start using solar ovens?)

B SPEAK. Work with a partner. Look at the timeline. Take turns asking and responding to the
questions or statements in exercise A.

?
A: Is it true that people cooked over open fires in prehistoric times
B: Yes, the timeline shows that people cooked over open fires in Egypt then.

Open-fire Cast-iron Wood-burning Beehive- Electric Microwave Solar
cooking stoves stove shaped ovens stove ovens in ovens in
homes homes

Egypt China France England Early America Canada
(prehistoric) (220 AD) (1490) (1826) (1800s) (1882)