The Australian boy has a good ________ of Chinese and can express himself freely in it.
Please refer to the before you switch on the engine.
When he left _____school, he got a job as _____secretary in a food company.
—May I use your phone? I left mine at home. — _____ Here it is.
— Do you mind if I leave my car here for a minute? — ________.
The message is very important, so it is supposed as soon as possible.