根据首字母及句意补全单词。
1. You should brush your teeth t _____ a day.
2. What's the m _____ with you, young boy?
3. I'm p ______ to take a trip to Kunming.
4. I'm so thirsty. I want s _____ to drink.
5. Could you take c _____ of my pet dog while I'm away?
1. twice 2. matter 3. planning 4. something 5. care