Task 1 a) Check your grammar: gap fill – irregular past simple Complete the sentences using the past simple form of the verb in brackets.

1. Four and a half billion years ago, the Earth no moon. (HAVE)

2. The early Earth bombarded with rocks. (BE)

3. And then along something much, much bigger. (COME)

4. Another planet the Earth. (HIT)

5. The impact a mass of liquid rock into orbit. (SEND)

6. Our world no longer alone. It a huge, powerful

neighbour. (BE, HAVE)​