How many of us ____ a meeting that has nothing to do with us is not important at all.

The importance ______ a national day and how it is celebrated are very different from country to country.

Every time he had a chance，he would talk about the great difficulty he had _____ in the new country．

_____ he’s only been learning English for a year, he speaks it very well.

______the room, a letter was seen lying on the desk.