Question

Complete the sentences. Use one of the words in each pair.

grow/growth; cure/to cure; develops/developed; existence/existed; become extinct/extinction

1. Scientists haven't found a ________ for cancer.

2. More countries will __________ GM crops.

3. Greenpaece is worried about the _____________ of animals like tigers.

4. Dr Fleming _________ penicillin in 1928.

5. Dinosaurs _________ millions of years ago.

Answer 1

1. cure

2. grow

3.existence

4.developed

5. become extinct