accept a. It ____ now that increases in global temperatures are due to human activity. b. Most scientists ____ that we need to take action to reduce global warming. not know a. We ____ exactly how many stars there are in the solar system. b. It ____ exactly how stars were first formed. think a. Some researchers ____ that it could be possible to live on Mars. b. Mars ____ to have water under its surface. believe a. In the past, many diseases ____ to be caused by having too much blood in the body. b. Doctors in the past ____ that they could cure diseases by removing blood from the body.

Perspectives 3. Unit 5C. Student book . Exercise 3, p. 137

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