3. Many scientists believe that dinosaurs became extinct when a hit the Earth. 4. A eclipse occurs when the moon is hidden by the sun.
5. Many people wonder if there is intelligent life elsewhere in the .
6. The teacher told us to draw a line across the page.
7. The most successful products in the world are those that have a appeal.
8. energy is becoming more common nowadays.
9. Venus is unusual because it in the opposite direction to other planets.
10. The of Venus has many craters caused by asteroids.
11. Mercury has no substantial .
12. Mercury does not have any water so cannot life.
13. The Voyager space has provided us with pictures of Saturn’s moons.
14. The of Saturn is mainly gas.
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On February 23, we traditionally celebrate Defender of the Fatherland Day, one of the most important holidays in the calendar of Russians. This is not just a day of honoring soldiers and fighters who served and defended the country during the war and tribulations - the landmark date has already turned into a kind of unofficial "day of all men". After the collapse of the USSR, the holiday has not disappeared - it is still popular, and it is still celebrated not only in Russia, but also in Transnistria and Ukraine. Since 2002, February 23 is a day off in the Russian Federation.

1. I have to work hard now because I was ill and I fell behind the group.
2. You'll have to talk to him in person./=(tete-a-tete) /(face to face)
3. We had to wait out the rain at the station.
4. I had to apologize, even though it was unpleasant for me.
5. The book must be rebound, otherwise some pages may be lost.
6. You have to get up very early, don't you?
7. He had to make a remark to you, didn't he?
8. He didn't have to take the entrance exams.
9. We didn't have to escort them /(=to see them off) to the hotel.
    They themselves knew the way very well. 
10. The work will have to be done today.
11. He said you'd have to go there alone.
12. The whole page had to be reprinted because of one misprint. /(typo).