Test Two. Use the verbs in brackets in the appropriate forms to complete the text.
Halley's Comet
Halley's comet is a comet that (1. return)
to the
solar system every 76 years. You ever (2. hear)
anything about it? It (3. name)
after the English astronomer Edmond Halley who (4. see)
it in 1682.
Halley (5. know)
that people (6. see)
bright lights in the sky before. It (7. happen)
in
1531 and in 1607, so he (8. do)
a little mathematics and (9. say)
that the space visitor (10. come)
back again in 1758. What Halley (11. predict)
became a scientific fact. Halley was also sure that in
the future, men (12. travel)
to the comet and ride
it around space. In 1986 the comet (13. appear)
near the Earth again. Astronomers from 51 countries looked through their telescopes. They (14. watch) for the old visitor from very far away. And sure enough, there it was, right on time.​

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