Rewrite the sentences without changing the meaning

Ex 3: Rewrite the sentences without changing the meaning.

1. Sarah is better at chemistry than Susan.

    Susan isn’t ..................................................................... .

2. They provided food and aids, then they cleaned up the debris.

    After…………………………………………………….

4. They have built three factories this year.

   Three new factories ........................................................... .

5. He’s never made such a bad mistake.

   It’s ................................................................................. .