________ the difficult maths problem, I have consulted Professor Russell several times.
The Australian boy has a good ______of Chinese and can communicate with others freely.
Please ______the money and I’m sure it will ______more than 1,000 yuan.
---The air would certainly be cleaner if there were fewer cars running in the city. ---_______.
_________, I always feel I want a few more days.
---How do you find my composition, Mr John? ---Good, ___too many spelling mistakes. You can’t imagine what great difficulty I had ___them.