Modal verbs to express ability

I was very happy that I could/was able to meet all your friends when I visited you last month.

I could buy / could have bought my tablet cheaper online, but I got it from my nearest independent computer shop instead because I like to support local businesses.

She’s absolutely amazing – she’s only seven and she can/could speak five languages, including Japanese.

I wasn’t able to/can't translate the text into French, because it contained too many unfamiliar expressions.

Thank you for your job offer, but I am afraid I can’t/couldn't accept it.

When I was a small child, I could / was able to sing beautifully, but my voice isn’t so good now.

Can you / Are you able to hear the neighbours’ television? It’s far too loud!

Even though we were cold and tired, we were able to / manage to reach the top of the mountain.

Could/Can you understand basic economics when you were eight?

He managed to/could run the marathon in less than three hours, although he hadn't been training regularly for ten days.

We were able to/could find our way around Rome easily by using online maps on our smartphones.

I’ve searched everywhere for my car keys, but I can’t/couldn't find them anywhere.

I could/was able to taste and smell the garlic for hours after the meal.

I can’t/couldn't lift this armchair – it’s so heavy! Could you help me, please?

I’m really pleased to hear that you could/can come to visit me next month.

I was so worried that I couldn't sleep / couldn't have slept and I stay awake all night.

He was delighted, because he was able to/could find a taxi and get to the party on time.

I can’t/couldn't carry everything, so I had to leave some things behind.

He couldn’t/can't get to the meeting on time yesterday, because his car broke down.

Although the shop was very crowded, we could / were able to get the shopping done quite quickly.