【原创】He knew the problem was serious and promised to look into it _____ he reached office.
--Tell me where you live, please. --I live____________.
If you want to see a doctor, fix the date with him ahead of time. This is a common ___________ in the USA. A. habit B. law C. rule D. custom
I can't make a decision now. I need _________ more time to think it over.
with the size of the whole earth, the highest mountain doesn't seem high at all.
He is believed____________ in at his office on his way home.