1£®Li Guang has made a series of plans of visiting the Mars.First, he must get himself accustomed(accustom) to the life in the Mars probe.Second, he has to have enough patience (patient) to consult the astronomer about how to grasp himself when in space.Third, he ought to_be(be) able to foresee what will happen once he set foot on Mars.

2£®In spite of there being(be) varieties of difficulties in exploring the Mars, human being sets out to_land(land) on Mars.Whether you acknowledge it or not, our motherland has made great progress in exploring the space.

3£®Do you know that the environment on the Mars is very similar to the Earth's? If the assumption that there is water on the Mars proves to be true, it will have a great impact on our future life.Maybe in decades(decade), every one of us will have a chance to view our Earth on the Mars.