填写单词：1._____can_____very fast in cars or boats,but_____can m

填写单词：
1._____can_____very fast in cars or boats,but_____
can move very fast on land or in the water_____machines.
2.The_____people can run 100m in 9.78_____.
3._____are the best runners.They can run_____per hour.
4._____can swim 39 km_____ hour.
5.The_____can swim_____per hour.