Question

(i) Coronary bypass surgery is undoubtedly a very significant achievement of modern science.
(Use 'which' and rewrite the sentence.)
(ii) The heart surgeons perform a special type of operation.
(Begin your sentence with 'A special type of operation......')

Answer 1

Coronary bypass surgery, which is an achievement of modern science, is undoubtedly very significant.

A special type of operation is performed by the heart surgeons.