用所给词的适当形式完成下列句子。

1. We need to be more________ (science) about this problem.

2. Dark sunglasses are used for________ (keep) out the strong sunlight.

3. I am nearly________ (confuse) about the ________ (confuse) traffic signs.

4. Why not consider ________ (change)a job?

5. I sometimes felt ________ (embarrass) when speaking in front of many people.