1.The day before yesterday was (Saturday).(对小括号里的提问）
What day was the day before yesterday?
2.I want to buy (a flower) for my mother(对小括号里的提问）
What do you want to buy for your mother?
3.There are (thirty) days in November(对小括号里的提问）
How many days are there in November?
4.There is no water on the desk.(同义句）
There isn't any water on the desk.