The cars give off a great deal of waste gas in the street.—Yes, But I’m sure something will be done toair pollution.

ke to have visited the Palace Museum, but somethingunexpected _______ to my father

Hardly _____ closed my eyes ___ I began to make this fantastic dream .

can you work this Sunday—________ I’ve been working for two weeks on end.

Wind power is an ancient source of energy ________ we may return in the near future.[ ]