Subject – verb – number agreement –spot the error

The intervention of satellites leads to many space shuttle program

Cats are in general a calm animal, it require a pleasant environment

Three more numbers are required to complete the target today

Both are responsible for recent fire breakout in the building

A prolific writer, Sir Walter Scott's works include the poem The Lady of the Lake and the historical novels Ivanhoe and Waverley.

A. A prolific writer, Sir Walter Scott's works includeB. The works of Sir Walter Scott, a prolific writer, includeC. Sir Walter Scott was a prolific writer including in his

worksD. Included in the prolific writer Sir Walter Scott's works

isE. The prolific writer's works of Sir Walter Scott include

The fluctuation in interest rates over the past few years have proven troublesome for both borrowers and investors.

A. have proven troublesome for both borrowers and investorsB. has proven troublesome in regards to both borrowers and

investorsC. Had proven troublesome for both borrowers and investorsD. Has proven troublesome for both borrowers and investorsE. Has been causing trouble towards both borrowers and

investors