—I’m afraid you missed a fantastic lecture yesterday. How come you were absent from it?—If you _______ know, I asked for a day off and visited a relative of mine in hospital.
Work hard at your lessons, ______ you’ll fail the exams again.
We’ll never forget the days ______ we spent in the country.
Every time I _______ to the shopping center, I will buy my son something nice.
According to the weather forecast, it will be _____weather that we had better stay at home.
He had to take the medicine 3 times a day to be _______ the pain in the leg.