While cleaning the room yesterday, I_______ an old photo of my mother.

下面各句中，加横线词语运用正确的一项是 （ ）

are many places in the world have been visited only by a few, many are of enormous beauty.

In the UK and the USA people often giveflowers and cakes as birthday presents. They ________ open their presents atonce.

How can I get more information about your products—_____ to call the sales office or visit our website.