_____ (train) yourself before the walk is very important.

_____ (train) yourself before the walk is very important. lt is necessary that train yourself before the walk The secret___ before an important exam is to tell yourself t the question now _____ at the meeting is very important I think _____ care of the environment is very important There is still_time before the train leaves _____ is very important for our health. The computer is very important to us The computer is _____ _ _____ the students,it is very important to know how to study The train is running fifty miles _____. this is the train _____定语从句 汉译英The train is traveling_____ _____ _____ _____ sixty kilom