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.
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) century, discovered that the earth exerts a pull (2) on everything. The pull of the earth is called (3) gravity.
Once in outer space, man (4) is no longer affected by the earth’s gravity. Imagine you were in a space capsule (5) orbiting the earth. Sitting or lying would be a (6) problem to you because you wouldn’t be able to keep your chair or bed then. How would you (7) make 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) weightless conditions.
II. Give the correct tense or form of the verbs in parentheses :
1. Do you consider (invite) inviting Jane and Jim to your birthday party ?
2. There are many signs (tell) telling people (be) to be careful when (come) coming near the wild beast.
3. Would you mind (shut) shutting both of those windows ?
4. That follow seems (trust) to be trusted by everyone.
5. The first fish (appear) appeared on the earth about 500 million years ago. Up to now, over 20,000 kinds of fish (name) have been named and (describe) described by scientists. New species (discover) are discovered every year, so the total increases continually.
6. Sally reminded me (ask) to ask you (tell) to tell Bob (remember) to remember (bring) to bring his soccer ball to the picnic.
