1. —He says he is still reading The Old Man and the Sea
—He can’t __________ （还在读那本书）. I gave it to him ages ago and it’s quite a short book. （read）
2. Helen had to shout to make __________ （人们听到她的话） above the music at yesterday’s party. （herself）
3. Every possible means __________ （已用来） to prevent the air pollution, but the sky is still not clear. （use）
4. The boy couldn’t give the teacher a good reason for __________ （他上学迟到）. （be）
5. From the distance __________ （来了一个士兵） who was riding a horse. （come）
