Before a problem can be solved, it must be obvious ________the problem itself is.(2011·湖南)

What a lot of fun it is to visit Taiwan! — Isn’t it rather risky, ____? It is reported that the typhoon is coming![ ]

If I felt some pain, I would stop _________.

It was _____ so that made Jim very angry.

The way ahead was blocked by a fallen tree, so we had to go by an_____ road.[ ]