Fill in the blanks with the most appropriate option:-

I have lived in Canada ______ 10 months.

for

The most appropriate option to fill in the blanks is for.

The sentence "I have lived in Canada for 10 months" is in the present perfect tense, which is used to talk about an action that started in the past and is still happening now. The other options are not as appropriate.

• From is used to talk about a starting point. This does not make sense in the context of the sentence, as the speaker is not talking about starting to live in Canada 10 months ago.
• Since is also used to talk about a starting point, but it is more specific than "from". This is not the most appropriate option, as the speaker is not talking about a specific starting point for living in Canada.
• Before is used to talk about a time before something else happened. This does not make sense in the context of the sentence, as the speaker is not talking about a time before they lived in Canada.