what should we do when we brush our teeth according to the conversation?
举一反三
- 中国大学MOOC: What should we do when we practice our speech?
- We should brush our ______ every day. A: tooth B: teeth C: hand D: face
- We should brush our __________ twice a day. A: tooth B: teeth C: tooths D: teeths
- We need to<br/>brush our teeth ___ we sleep. () A: before B: after
- We brush our teeth every night as part of our .（老规矩，惯例）