The reason Beethoven went away to the country is ______.

I used to go camping a lot, so it isn’t the first time I ____in a tent.

Did Alan see his old friends yesterday? —Yes, he did. Hehis old friends for several years.

It _______ seven years __________ Hong Kong returned to China.

The man in the office ____be Mr. Black because he phoned me from London just now.