Complete the following sentences by choosing the correct ending. Write down

Complete the following sentences by choosing the correct ending. Write down the sentences.
1.nbsp; nbsp; Tornadoes consist of
a)nbsp; nbsp; large clouds and terrible sounds;
b)nbsp; nbsp; very strong winds.
2.nbsp; nbsp; Bright flashes of lightning
a)nbsp; nbsp; are seen from the distance;
b)nbsp; nbsp; blow down everything on their way.
3. Tornadoes are dangerous because
a)nbsp; nbsp; they occur in spring;
b)nbsp; nbsp; they destroy houses and pick up everything they can.