— I called you at nine this morning, but there was no answer.— Oh, sorry, I ______ with my sister in the shopping center.
It’s surprising that Mr. Ma’s little daughter _____ speak English so well.
–May I use your MP4 today, Paul? --_______. I will not use it.
I will try my best to stop my son from _____ the same mistake.
–_____ did you work out the problem in such a short time? --With Mr. Li’s help.
They walked home last night because they couldn’t _____ to take a taxi.