Match the beginnings and endings of the sentences. 1. Some scientists are worried because …
2. They copied the virus because …
3. Some scientists believe a pandemic will not happen because …
4. Scientists copied the Spanish flu virus …
5. The 1918 flu pandemic …
6. Bird flu …
a. … they wanted to find out why it was so lethal.
b. … by using material from the lungs of people who died from the virus.
c. … started with bird flu.
d. … the Spanish flu virus might escape from the laboratory.
e. … might pass from birds to humans.
f. … most people are naturally immune.
Fill the gaps using prepositions. Check your answers in the text. 1. escape _______
2. inject _______
3. worried _______
4. information _______
5. die _______
6. mix _______
7. protect _______
8. different _______