请用下列单词填空: What how when where who that if 1) It’s Christmas Day. The children don’t know __________ is in their stockings. 2) David borrowed 200 Yuan from me last week, but he hasn’t paid me back. I wonder __________ he will pay me back. 3) Joyce was going to visit a friend. Her father asked __________ her friend lived. 4) This box is really pretty. But there is no name on it. I’ve forgotten ______ gave this gift to me. 5) The doctor asked Amy __________ she injured her leg. She said she fell down and broke her leg. 6) This book is very interesting. I find __________ I can’t stop reading it. 7) The teacher gave us too much homework. I wonder __________ I’ll have enough time to do it!