Giới từ AT IN ON

Columbos discovered America ......... 1492.

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You can see the stars ............... night, if the sky is clear.

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Tom isn't here ............. the moment. He'll be back ............. five minutes.

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The course begins ........... 7 January and ends ............ 10 March.

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Tom's grandmother died ........... 1977 ........... the age of 79.

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The price of electricity is going up ............. October.

Ann works hard during the week, so she likes to relax ............. weekends.

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I can't be at home ............ the morning. Can you phone me .......... the afternoon instead?

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Jack's brother is an engineer but he's out of work ........... the moment.

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............. Sunday afternoons I usually go for a walk in the country.

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