1. The teacher couldn’t make himself ____ attention to because students were addicted to the short message.
A. pay B. paid C. to pay D. to be paid
2. ______ disappointed us most was that the guide was always asking us to leave ____ we thought very interesting.
A. What; what B. It; where
C. What; where D. It; what
3. We must keep our room clean. Dirt and disease go _______.
A. from time to time B. hand in hand
C. one after another D. step by step
