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They greeted us warmly ________ our arrival.

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We haven't decided when we shall start yet.

We haven't decided ________ ________ ________ yet.

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It is difficult to get a clear picture of space because of the dusty air.

The dusty air ________ ________ difficult to get a clear picture of space.

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Why don't you go to the airport to see her off?

Why ________ ________ ________ the airport to see her off?

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The lake was very beautiful. We took the photos by it.

The lake ________ ________ we took the photos was very beautiful.

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That he didn't come to the party yesterday is very strange.

It ________ ________ strange ________ he didn't come to the party yesterday.

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After he left school, he became a teacher of maths in a faraway village.

After ________ school, he became a teacher of maths in a faraway village.

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The students spent the afternoon in doing their homework.

It ________ the students the afternoon ________ ________ their homework.

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A new hospital was reported to have been built here.

________ was ________ ________ a new hospital ________ been built there.

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She appeared not to have got my letter.

________appeared________ ________ ________ got my letter.