请你用所给词的适当形式完成下列句子.

1. Here are some things they have learned from _____ (scientist ) studies.

2. Sunglasses are used for _____ (keep) out the sun.

3. The students are _____ (confuse) about the _____ (confuse) problem.

4. I'm considering _____ (study) in Beijing or Shanghai.

5. I felt _____ (embarrass) when everyone looked at me.