We walked all day, and at 5:00 we *** reach the top of the mountain.

• can

• could

• was able to

• were able to

I was so worried that I *** and I lay awake all night.

• couldn't sleep

• couldn't have slept

• can't sleep

• was able to sleep

When I was a small child, I *** sing beautifully, but my voice isn't so good now.

• could

• was able to

• were able to

• can

*** hear the neighbours' television? It's too loud!

• Are you able to

• Can you

• You can

• You are able to

I *** my tablet PC more cheaply online, but in fact I bought it from my local computer shop.

• could buy

• could have buy

• could have bought

• could bought

Although the shop was very crowded, we *** get the shopping done quite quickly.

• could

• was able to

• can

• were able to

I *** carry everything, so I had to leave some things behind.

• can

• couldn't

• can't

• could

I was very happy that I *** meet all your friends when I visited you last month.

• can

• could

• was able to

• were able to

I'd be grateful if you *** advise me about which book to buy.

• can

• could

• was able to

• were able to

I'm really pleased to hear that you *** come to visit me next month.

• can

• could

• was able to

• couldn't