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There’s no way of knowing why one man makes an important discovery         another man, also intelligent, fails.

— What did he think of the trip to Beijing last month？
— He had such a good time ________ he visited the Great Wall.

_______ I take part in a group discussion or try to speak English to someone, I find it difficult to express myself.

Many of them turned a deaf ear to his advice, ________ they knew it to be valuable.

It may be 5 or 10 years __________ it is possible for people to find a space station on the moon.

Bob is determined to get a seat for the concert _______ it means standing in line all night for the ticket.

The young man always talks a lot ___________ he knew everything, which, of course, makes others unhappy.

She was about to leave the room       the telephone rang.

He seems to be giving the information that he didn’t enjoy himself in Paris. _____, he had a wonderful time.

______ he used traditional materials, Gaudi was a modern architect.