Noun clause (for Paper-based TOEFL)

Why the condition of the patient deteriorated so rapidly it was not explained.

• Correct

• Incorrect

Whether or not the new office would be built was to be determined at the meeting

• Correct

• Incorrect

That the professor has not yet decided when the paper is due.

• Correct

• Incorrect

The contract will be awarded is the question to be answered at the meeting.

• Correct

• Incorrect

He always talked with whomever he pleased and did whatever he wanted.

• Correct

• Incorrect

The voters should elect whichever of the candidates seems best to them.

• Correct

• Incorrect

It was difficult to distinguish what was on sale and what was merely on display.

• Correct

• Incorrect

You should buy whatever the cheapest and most durable.

• Correct

• Incorrect

What was written in the letter angered him beyond belief.

• Correct

• Incorrect

You can spend your time with whoever important to you.

• Correct

• Incorrect