3. The exam turned out to be very easy, ____I hadn’t expected.
A. as B. what C. which D. it
4. The bus rolled into the valley, _______ over 20 deaths.
A. caused B. having caused C. causing D. to cause
5. He was glad that his experience in the army finally ________.
A. paid back B. paid for C. paid about D. paid off
6. Make marks _______ you have questions.
A. which B. in which C. where D. in where
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