It was nine years ago, ________ I went to the UK for the first time, ________ I began to learn English.
Facing the ________situation, the boss of the company looked____
As we all know, _________ car is becoming _________ popular way of transportation in big cities.
—Tom, you are smoking again?—______? It’s none of your business.
It was too hard for the firefighters to get close to the burning building. All their attempts to rescue the people trapped were ______.
When first _______ to the market, the products didn’t attract much attention.