1．They were also in constant (时常发生的) communication with people on the earth.
2．He has no previous (早先的) experience of this kind of work.
3．Although he was badly ill，he was optimistic (乐观的) about his life.
4．You'd better make some adjustments (调整) before handing in your paper.
5．Jim's real problem is that he lacks(缺乏) confidence.
6．When walking in the street，a car suddenly flashed its headlights at me.
7．Only in this way can we live in more comfortable and beautiful surroundings．
