根据中文提示，用词组的适当形式填空。

1. Please ___________ ___________ (关掉) the radio. It's too loud.

2. I'm glad you have arrived ____________ ____________(准时) —the dinner is ready. 

3. This old photo ____________ me ___________(使…想起) my happy childhood.

4. —You look tired. What happened?   —I ___________ __________ (熬夜) late last night.

5. I've _________ ________ (赠送) some clothes to charity because they are too small for me. 

若y=e^2x+(x+1)e^x是方程y"+ay’+by=ce^x的解，求a，b，c及该方程通解．