more than 1300 hotels in Europe, Africa, Middle East region have committedto _________ in the event, with many more ________ to join the effort.

I found some oldpictures at the back of my drawer which _____ memories of my childhood.

What’s the date today—It’s _______.

The real secret to successful learning lies instudents＿＿＿＿an interest in what they are doing.

It suddenly occurred to him _____ he had left his keys in the office