Well guess I'll start with a few questions then:

Easy:
What is the one drink House Elfs should not drink?
Answer: Butterbeer

When do we first meet Dobby?
Answer: HP: Chamber of Secrets


How do House Elfs move about?
Answer: Aparate

Medium (with tips)

How did Dobby get freed?
Answer: Harry tricked his master.

Tip: H.... t...... h.. m.....
Tip: .a... .r..... .i. .a....
Tip: ..r.. ..i.... ..s ..s...
Tip: ...r. ...c... ... ...t..
Tip: ....y ....k.. ... ....e.
Tip: ..... .....e. ... .....r
Tip: ..... ......d ... ......

What happened to Winky at the Quittich World Cup?
Answer: She was sacked.

Okay, that's all I have for now. Highlight to see answers.