Is it possible to omit prepositions in the following three examples? Is it common to omit them?
1) I was surprised (at) how fast he read.
2) We should think seriously (about) why we need them.
3) I was impressed (by) how beautiful the scenery was.
Yes, both possible and common. In careful formal English I would include them.
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Yes, both possible and common. In careful formal English I would include them.