Where is your mother— She ______ Australia and she ______ Sydney for two weeks.

I showed an old friend of mine around the city,surprise, the changes had been so great

Do you think it _____ to argue with them?— The question is not worthy _____.

ition for entry to these programs is keen, and applicants need above-average grades to gain ________.

The two companies decided to work together ______ they had common interest.