1. Galileo discovered Jupiter's moons. 2. You can’t see any stars during the day.
3.500 meteoroids enter the Earth's atmosphere every year.
4. Shooting stars can be dangerous to the Earth.
5. The time between a new moon and a full moon is 29.53 days.
6. You can still see the Moon during a lunar eclipse.
7. A lunar eclipse happens once every year.​

1. I (was sitting) in an armchair and ( thinking) of rny coming trip across the North Sea when the door suddenly ( opened) and an old friend of mine whom I (had not seen) for a very long time ( entered) the room.
2. She ( came) to see us just at the time when we (were having) dinner. It (was) the first time I (have seen) her.
3. I (saw) him just as he (was leaving) the hotel.
4. I (had not seen) him before we ( met) at the concert.
5. He (had left) the house before I (had) time to ask him anything.
6. He ( told) me he (had learnt) it from the newspaper.
7. He ( entered) the room, (took) something from the desk and (went) out. 8. There (were) two men in the room. One of them (was writing) something while the other (was reading) a newspaper.
9. He (did not tell) me that he (had received) a telegram from her.
10. I ( asked) him if he ( knew) where she ( lived). I ( said) I (did not  know) her address.
11. He ( asked) me if I (could) give him your address.
12. She ( said) that he (had given) her the wrong address.
13. I ( asked) him where he (had put) my letter.
14. He (told) us that they (had spent) all the money.
15. After spending several days in Paris he ( felt lonely and ( wanted) to return home.
16. I (thought) he had already (gone) home.
17. I (found) the old man in the garden. He (was talking) to some children who (were standing) around listening to him.
18. He (was speaking) a language we had never (heard) before.

1. I (was sitting) in an armchair and ( thinking) of rny coming trip across the North Sea when the door suddenly ( opened) and an old friend of mine whom I (had not seen) for a very long time ( entered) the room. 2. She ( came) to see us just at the time when we (were having) dinner. It (was) the first time I (had seen) her. 3. I ( saw) him just as he (was leaving) the hotel. 4. I (had not seen) him before we ( met) at the concert. 5. He (had left) the house before I ( had) time to ask him anything. 6. He (told) me he (had learnt) it from the newspaper. 7. He ( entered) the room, (took) something from the desk and (went) out. 8. There (were) two men in the room. One of them (was writing) something while the other (was reading) a newspaper. 9. He (did not  tell) me that he (had received) a telegram from her. 10. I ( asked) him if he ( knew) where she ( lived). I ( said) I (did not know) her address. 11. He (asked) me if I (could) give him your address. 12. She (said) that he (had given) her the wrong address. 13. I (asked) him where he (had put) my letter. 14. He (told) us that they (had spent) all the money. 15. After spending several days in Paris he ( felt) lonely and ( wanted) to return home. 16. I (think) he has already ( gone) home. 17. I ( found) the old man in the garden. He (was talking) to some children who (were standing) around listening to him. 18. He (was speaking) a language we had never ( heard) before.