1, 9.87 l = () ml 2700 cubic centimeters = () cubic decimeter.

2. Fill in the appropriate unit of volume in the brackets.

(1) Children need to drink 1 100() (2) A bottle of shampoo is about 500 ().

(3) Xiaojun's family uses cooking oil every month. (4) A barrel of yogurt is about 1.25 ().

3. Mid-term exam papers and answers in the second volume of fifth-grade mathematics: the minimum natural number is (), the minimum odd number is (), the minimum prime number is (), and the minimum composite number is (). The largest four digits of these four numbers are ().