John, look at the time. ____ you play the piano at such a late hour?
----What’s it that cost him the job?----_______ experience .He was always very nervous.
----May I help you, Madam ? ----I’d like to have ______ those eggs .
As an excellent translator , he reached a high level of ______ in his English.
Li Gang was required to apologize ___ the people present at the meeting ______ what he had done .
Tom , you ______ leave all your clothes on the floor like this!