2) a) The Spanish Flu killed between 50 and 100 million people and made over 500 million people sick,

• didn't it

• did it

• don't it

• do it

2) b) Vaccine-preventable diseases have not disappeared yet,

• haven't they

• didn't they

• did they

• have they

2) c) The plague, unlike most epidemic diseases, did not show a predilection for the poor, the children and the elderly,

• didn't it

• did it

• haven't it

• have it

2) d) Smallpox was eradicated in the 1970s,

• was it

• wasn't it

• did it

• didn't it

2) e) Domestic animals cannot transmit infectious diseases,

• will they

• should they

• can't they

• can they

3) a) I'm trying my best to keep myself healthy,

• am not I

• aren't I

• Am I

• are I

3) b) We have done everything in our power to reduce the outbreaks of vaccine preventable diseases,

• have we

• haven't we

• did we

• didn't we

3) c) There was nothing else we could do about it,

• was there

• wasn't there

• didn't there

• did there

3) d) This dosage won't be enough to help him,

• won't it

• will it

• would it

• wouldn't it

3) e) You never got your immunizations,

• did you

• didn't you

• haven't you

• have you