Question

4 V 2 * Choose the correct verb in brackets and complete the text with affirmative and negative forms of could, can and will be able to. 1 Advances in Medical Science Two hundred years ago, medical science was very basic and doctors could perform (perform / suffer) only simple operations. They (cut/use) X-rays to see inside their patients until about 100 years ago. Doctors ? (cure / cause) most infections until the discovery of penicillin in 1928. Recently, there have been incredible advances in medical science. Scientists (experiment / clone) animals these days, but they (clone / prevent) humans yet. In the future, doctors 5 (operate / discover) on people using nanobots. People 6 – (sleep/live) longer, perhaps 150 years, but we? (live/transplant) forever! ​

Answer 1

1.could perform

2.couldn't use

3.couldn't cure

4.can clone

5.can't clone

6.will be able to operate

7.will be able to live

8.won't be able to live

Answer 2

Advances in medical science two hundred years ago were very basic and doctors were only able to perform simple operations. They could use x-rays to see inside their patients until about 100 years ago. Doctors could not cure most infections until the discovery of penicillin in 1928.

Recently, there have been incredible advances in medical science. Scientists are able to experiment on and clone animals these days, but they are not yet able to clone humans. In the future, doctors will be able to operate on people using nanobots. People will be able to sleep/live longer, perhaps 150 years, but we will not be able to live/transplant forever.