Put the words in order to make sentences.
1.we/just/TV/programme/on/a/watched/have/.
2.on/discovered/yet/life/they/Mars/haven't/.
3.already/astronauts/landed/moon/on/the/have/.
参考答案:We just have watched a programme on TV.
They haven't discovered life on Mars.
Astronauts have already landed on the moon.