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PRACTICE

9 Complete the sentences with if, that, or whether. Write all possible answers.

1. Did you know __ that we are quickly losing many different varieties of food?

2. Experts believe _.__~———SS—s Wwe used to have more than 7000 types of apples. Now we
have fewer than 100.

3. The problem is _____ we may lose even more food varieties in the future.

4. Some people wonder the food varieties we depend on might become
extinct.

5. Do you know _____———————Saor not anything can be done to prevent the loss of more
foods?

6. Many people hope ____————S we will be able to protect our future food supply by
saving seeds today.

7. Are scientists worried ________ our food sources will be threatened by climate
change?

8. Iwonder____________ governments around the world are doing anything to help.

10 Complete the exercises.

Put the words in the correct order to complete the conversations. Add the correct end
punctuation. Each sentence has a noun clause.

Conversation 1
Jen:
Do you know where potatoes were first grown?
(1) where / were / know / potatoes / you / first grown / do

Dan:
(2) originally came / think / | / from Ireland / that / potatoes

Jen: They came from Peru.
(3) that / you're / I'm / wrong / afraid

Dan:
(4) potatoes / | / never realized / South America / came from / that

(5) | / how many / are grown there / wonder / varieties of potatoes

Jen: Thousands. They are really important to the people of Peru, too.

Dan: Really?

Jen: Yes.
(6) | / heard / hold a special ceremony / they / after the potato harvest / that

398 NOUN CLAUSES AND REPORTED SPEECH
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