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When he was 14, Mozart had composed many pieces for the harpsichord.

________ ________ ________ he was 14, Mozart had composed many pieces for the harpsichord.

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He learned to play the harpsichord when four.

He learned to play the harpsichord when ________ ________ four.

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After he had worked there for 30 years, Haydn moved to London, where he was very successful.

________ ________ there for 30 years, Haydn moved to London, where he was very successful.

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After studying music in Vienna, Haydn went to work at the court of a prince in eastern Austria.

After ________ ________ studying music in Vienna, Haydn went to work at the court of a prince in eastern Austria.

用所给动词的适当形式填空

We ________(sail) four days and four nights before we saw land.

用所给动词的适当形式填空

Before I could get in a word, he ________(measure) me.

用所给动词的适当形式填空

I'll stay here until the rain ________(stop).

用所给动词的适当形式填空

The boy ________(burst) into tears immediately he saw his mother.

用所给动词的适当形式填空

No sooner ________ we ________(arrive) at the station than the train left.

用所给动词的适当形式填空

While I ________(walk) down the street, I came across an old friend of mine.