太急了。。。用英语单词造句。马上需要。。。。急急急！！！！！！！！！！

Jim, who is on the tricycel and not pupular with others, instructed his students to compete with each other underwater.

his requirments are: everyone must take some weight, and hold their breath underwater; there is only one chance for them to come up for breath. then, after 5 muniters or more, the students could go up and gasp, run to take the gun in the 20 yards.

In fact, these ones are not reluctant to take such games.