Find one error in each of the following sentences (A, B, C or D)

It is much easier for a foreigner to become an American citizen if he has a close relative whoever is already an American. 

Choose the best answer.

The last student that was interviewed was Tom. 

=>The last student _______.

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The city which was destroyed during the war has now been rebuilt. 

=>The city ______ during the war has now been rebuilt.

Choose the best answer.

He often tells me something about his village, _____ he was born.

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My brother, who met you yesterday, works for a big firm. 

=>My brother, _______, works for a big firm.

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She is the only student who gets the best mark in my class. 

=>She is the only student __________ the best mark in my class.

Choose the best answer.

Can you suggest a time at ____ it will be convenient to meet?

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John, who is my friend, has studied English for ten years. 

=>John, ________ , has studied English for ten years.