Put the Verbs in the brackets in the correct forms
1. For many years scientists (to study) the nucleus before they found that it is possible to split it.
2. Many power stations (to use) atomic energy for a long time before I knew it.
3. All this period scientists and engineers (to develop) rocket technology and electronics in close cooperation.
4. We widely (to use) electronic devices in industry for many years.
5. We know that our astronomers (to observe) the moon for a long time.
6. My friend (to make) these experiments to compare the weight of elements since the first of September
7. The question about the new experiment on this subject (to discuss) for some time before we came to a definite conclusion.
8. The fact that atom has a nucleus in its center, which is positively charged, (to discuss) by Ernest Rutherford in 1911.
9. This problem (to solve) in the near future.
10. The phenomenon of radioactivity (to use) widely in industry, medicine and agriculture
11. He found that this effect (to cause) by some unknown subatomic particles.
12. The weights of these particles (to calculate) with the help of electronic computer.
13. U-238 (to convert) into plutonium and then (to use) to generate atomic power.
14. These substances (to refer to) usually as hydrogen isotopes
15. One of the isotopes of hydrogen (to call) deuterium.
16. He (to puzzle) by these unexpected results.
17. It (to show) that these substances differed greatly in their chemical properties.
18. It (to expect) that the results of our research (to apply) in chemical industry.
2) Blini (pancake) feasts along with traditional amusements like snow-fortresses, snow-fights, merry-go-rounds, folklore songs and dancing will be held all over Moscow.
3) All the guests will have a chance to taste delicious pancakes made directly in Red square.
4) Those who wish to present their cooking talents will have an opportunity to compete in a pancake cooking competition.
5) The judges will estimate the cooking abilities of the competitors, counting the number of pancakes they can make without a brake.
6) On the last day of Maslenitsa all the feasting will end by burning down scarecrows symbolizing winter, thus saying good-bye to the cold season until next year.
Summer decorate gardens and orchards. Juicy cherries ripen, followed hurry apricots and peaches. Large red strawberries sloping low to the ground. Gradually the "tan" in the summer sun recently green tomatoes. Here and there on the arches are tied cucumbers. Prehensile prickly branches dotted with sweet blackberry completely dark purple, almost black berries. And so everywhere - a riot of color, celebration of fertility, a pleasant feeling of warmth and coziness.
Summer - bright, colorful ... May not like the August and July has something to please the eye. High clear skies, warm clear water rivers, ripe fruit, rich colors around ... There is not a man who would not love summer!