It will be more than 100 years ____ the country begins once again to look as it did before.
When ________ questions in class, one should answer them as clearly as possible.
It was not until I came here ____ I realized this place was famous, for not only its beauty but also its weather.
—How much shall I pay for the phone call? —You________. This is free of charge.
Food supplies in the flood-stricken area ______. We must act immediately before there’s nothing left.
—Have you got used to the Chinese food, Robert?—Yes, but I don't like ________ when a Chinese host keeps serving me the food I don't like.