11．It was only after he came back___________he decided to write to Kite to find out if he was wasting his time there

The weather is ______ in London, andumbrellas are very popular.

Experiments of this kind ___inboth the U.S and Europe well before the Second World War.

Where ___________ your pen pals from — The United States.

Who is your favorite singer, Mike—TF Boys. They are very ____ boys and girls.