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He joinedA the army about three years ago whenB he was eighteen. In other words he has joinedC the  army for about three yearsD.

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Why not to askA your teacher if you don’t understand what you haveB learned.

Your teacher will certainly be pleasedC ifD you ask him several questions.

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All of the people laughed whenA they saw an elephant givingB performances byC using it'sD trunk.

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If someone telephonesA me when I amB away, please ask themC to leave a message so that I can get in touch withD him after I return.

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Most of the old housesA in the neighbourhood disappearB, so now people in this areaC are livingD in their new apartments.

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─ Do you mind ifA I play theB piano now?

─ Of courseC. I enjoy music very muchD, you know

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They talked about the students and the thingsA whichB they remembered whenC they had studiedD in the high school.

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We had so muchA homework to do yesterday that I finishedB it until my father returnedC at 11 o’clock last nightD.

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As matter of a factA it is easierB for a Chinese to learn English than it isC for an EnglishmanD to learn Chinese.

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If nobody answersA atB the front door, you may try to knockC at the back door. MaybeD the house owner is cooking in the kitchen.

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