I. Fill in the blanks with the words from the box: weightless moving problem is make centuryorbiting gravity at on heavy do Isaac Newton, an English scientist in the seventeenth (1) __________, discovered that the earth exerts a pull (2) __________ everything. The pull of the earth is called (3) __________.Once in outer spac...
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I. Fill in the blanks with the words from the box:
weightless moving problem is make century
orbiting gravity at on heavy do
Isaac Newton, an English scientist in the seventeenth (1) __________, discovered that the earth exerts a pull (2) __________ everything. The pull of the earth is called (3) __________.
Once in outer space, man (4) __________ no longer affected by the earth’s gravity. Imagine you were in a space capsule (5) __________ the earth. Sitting or lying would be a (6) __________ to you because you wouldn’t be able to keep your chair or bed then. How would you (7) __________ water flow into your mouth when, without gravity, your drinking water had no weight to move ? Astronauts should, therefore, be carefully trained to face these (8) __________ conditions.
II. Give the correct tense or form of the verbs in parentheses :
1. Do you consider (invite) __________ Jane and Jim to your birthday party ?
2. There are many signs (tell) __________ people (be) __________ careful when (come) __________ near the wild beast.
3. Would you mind (shut) __________ both of those windows ?
4. That follow seems (trust) __________ by everyone.
5. The first fish (appear) ____________ on the earth about 500 million years ago. Up to now, over 20,000 kinds of fish (name) ____________ and (describe) ____________ by scientists. New species (discover) ____________ every year, so the total increases continually.
6. Sally reminded me (ask) ___________ you (tell) ___________ Bob (remember) ___________ (bring) ___________ his soccer ball to the picnic.