The teacher came into the classroom, _______ a book _______ his arm.

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He found himself _______ in the wrong direction of his home.

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The day we have been looking forward to _______ sooner or later.

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When the man with a scar came into the cafe I noticed a _______ look come over the waitress face although she did not say anything.

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All the books that have been contributed by the neighborhood are known _______ to the city public library the other day.

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Without facts, we can’t form a correct opinion, for we need to have actual knowledge _______ our thinking.

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A．which to be based on

B．which to base on

C．on which to base

D．which to base

I wonder why you won’t do it as _______ and it’s the third time you have done so.

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With a lot of difficult problems _______, the manager felt worried all the time.

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Tom pretended _______ it but in fact, he knew it very well.

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They knew him quite well. They had seen him _______ up from childhood.

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