1. The first person __ the classroom last Monday might know the reason. A. entered B. to enter C. who enters D. whom enters 2. Elvis Presley, died in 1977, earned millions of dollars. A. who B. whom C. that D. whose 3. Do you know that environmentalist ? A. with whom I used to work C. with I used to work B. with that I used to work D. with who I used to work 4. Exposure to pollution can cause many serious illnesses __ to death. A. that leading B. which led C. led D. leading.
