If you want to study in foreign countries, ____ good knowledge of the culture is regarded as ____ must for you to live happily.
Time, ________ correctly, is money in the bank.
Women are ________ an important role in social life.
—Will this pair of trousers ________ when washed? —I'm not sure. I am wearing it for the first time.
If we make ________ best of this new equipment, there will be ________ rise in our production this year.
After the war, a lot of serious problems ________ and the price of food ________ by 20%.