--- You've finally figured out the puzzle！--- Yeah, in a complex way, _______.

It seems that living green is               easy and affordable. A small step makes a big difference.

This pair of trousers isn’t good but that pair is ____better.

To be an astronaut, you must not only be strong in mind, but also be sound mentally and___.

(2009年合肥市高三第一次教学质量检测)The police tried to get some clues from the suspect，but he remained     ．