Underline the right preposition and re-write each sentence:
[click to underline between brackets]:
1. The postman is ( at / on ) the door.
2. Put these books ( in / on ) the shelf.
3. The shows start ( at / on ) half-past eight.
4. They are walking ( across / along ) the beach.
5. The workers are resting ( on / under ) a tree.
6. Stop and look ( after / before ) you cross the road.
7. Who is the boy sitting ( between / before ) Suma and her sister.
8. The farmers are returning ( from / to ) the fields.
9. The earth moves ( around / round ) the sun.
10. It is safe to put your money ( in / on ) the bank.