1. Fill in each blank with its appropriate form
Discover
nouns     discoverer, discovery
verbs    discover
1. He was later....to have been a spy
2. Scientists have made many important
3. Alexander Fleming was the .....of penicillin
4. Who....America?
5. Scientists have....how to predict an earthquake
6. Jim Watson and Francis Crick were the....of DNA

2. Fill in each blank with its appropriate form
Erupt
nouns     eruption
adjectives    eruptive
verbs    erupt
Abrupt
nouns     abruptness
adjectives    abrupt
verbs    abruptly
1. The volcano could....at any time (erupt)
2. Earthquakes often come together with volcanic..... (erupt)
3. The adjective of "eruption" is...... (erupt)
4. Violence....in the city on Friday night (erupt)
5. The party came to rather an.....ending when Tom's parents came home (abrupt)
6. The road ended in a....slope down to the sea(abrupt)
7. The talks ended...when one of the delegations walked out in protest (abrupt)