19

There is a legendary monster that people say lives in the deep Loch Ness lake in the north of Scotland. It is called the Loch Ness Monster, or “Nessie” for short. It looks like a dinosaur, with a small head on a long neck and humps on its back. People first saw Nessie in 1933.
«People first saw Nessie in 1933» - Люди впервые увидели Несси в 1933 году. (тогда, точное указание времени в прошлом) (Past Simple – простое прошедшее)

SEE

20

Since then, there have been many sightings and a few photographs. Now, scientists from New Zealand will use a special technique to see if there really is a Loch Ness Monster.
«Since then, there have been many sightings» - С тех пор было много наблюдений (с тех пор по настоящий момент) (Present Perfect – Настоящее совершенное)

BE

21

A research team will try to find some of Nessie’s DNA. Professor Gemmell said this would show if the monster really existed or not.
«Professor Gemmell said this would show if the monster really existed or not» - Профессор Джеммелл сказал, что это покажет, существует ли монстр на самом деле или нет. (прыжок через время, сказал в прошлом, что покажет в будущем, will меняется на would) (Reported Speech – согласование времен)

SHOW

22

The Earth is moving around the Sun at about 1,800 kilometers a minute. However, there is not / isn't anything close by to show this.
«However, there is not / isn't anything close by to show this» - Однако поблизости нет/нет ничего, что могло бы это показать. (вообще, общее утверждение) (Present Simple – Настоящее простое)

NOT BE

23

When traveling / travelling in a car, you see nearby bushes and building rushing by, but mountains in the distance don't seem to move at all.
«When traveling / travelling in a car, you see nearby bushes» - Путешествуя/путешествуя на машине, вы видите близлежащие кусты (когда путешествуя, по смыслу требуется причастие) (Participle I - причастие )

TRAVEL

24

If we had other satellites close by along the route of Earth's orbit, we'd see how fast we are going. But the stars are like the mountains, too far away to help us judge our speed.
«too far away to help us judge our speed» - слишком далеко, чтобы помочь нам оценить нашу скорость (us - нам) (Pronouns - местоимения)

WE