选用正确的疑问词完称问句。
how many, how much, how long, how soon, how often
1. — ____ do you usually have an art lesson?
— Twice a week.
2. — ____ will Tree Planting Day be?
— In a week.
3. — ____ CDs have you got?
— There are so many, I can't remember the number.
4. I can't say ____ I want to go back to my hometown.
5. — ____ has Miss Jones been in Beijing?
— For two and a half years.