1. Has it reached ______ (火星) yet??
2. The journey has taken ______ (数月).?
3. We haven't found life on other______ (行星) yet.?
4. The sun and its planet are called ______ (太阳系).?
5. It's an ______ (不载人的) mission.?
6. The______ (宇航员) have discovered many interesting things ______.?
7. The m______ (信息) has been around the country about three years.?