We often volunteer ______ the old men carry water.
举一反三
- Water is 1) __________. We all need water.
- We all like the boy ______ A: often years old B: ten-year-old C: at ten old D: of age often
- Water is so important, so we should save water. A: T B: F
- The cooling water jacket is common to all the cylinders but there are often （） to ensure that each cylinder receives the right amount and flow of water.
- There are often ( fewer / more ) unhealthy chemicals in bottled water than in tap water. These chemicals come from the plastic in the bottles.