Four words in the English language end with -dous . What are they?

Horrendous, stupendous, tremendous and hazardous

The seven words containing the word "light" are listed bellow, complete these words by replacing the asteristiks with the correct letters. Follow the clues provided
1. LIGHT**** (flash produced from storm cloud)
2. ***LIGHT (the light from the sky at sunset)
3. *****LIGHT (outdoor lamp with strong beam)
4. *LIGHT (difficult predicament)
5. LIGHT*** (device for viewing transparencies)
6. **LIGHT****** (understanding)
7. **LIGHT (great pleasure)

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