1.it take sb sometime to do sth 2.keep their eyes closed 3.be full of/be filled with 4.take a rocket 5.sleep with one's eyes open 6.make sb's eyes open 7.without air or water8.An elephant is a useful animal. (an错了,useful辅音开头,应用a)9.Nie Haisheng and Fei Junlong flew into space by rocket. 10.Keep the classroom clean.
