Rewrite the following sentences based on the given words.
1. He is crazy about beach volleyball.
→ He is........................................................................................... (fan)
2. What she fancy doing is to ride a bicycle around the park in the afternoon.
→ She is........................................................................................ (keen)
3. My grandfather needs to have a surgery. His heart problem is very serious.
→ My grandfather........................................................................... (for)
4. Lam has participated in many volunteer campaigns up to now.
→ Lam........................................................................................... (part)
5. They started to raise funds to help disable children in early 2009.
→ They......................................................................................... (since)