gain / gain in

[Lenka]

I had a look into a dictionary to find out something about this verb, however, I am not that sure I will be able to use the verb actively.

http://encarta.msn.com/dictionary_1861614126/gain.html
ad verb definition 2):
She was steadily gaining in confidence. <= is it possible to say the same sentence without "in"?


Another sentence:
Basketball is not a major sport in the Czech Republic, although it is gaining in popularity. <= can I both say "it is gaining popularity"?

[Mister Micawber]

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Both ways are OK.
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