__ _ina heavy traffic jam in a taxi while you are hurrying to the airport is quite aunpleasant experience．

What is that on the table –Oh, a set of ___________ on the table.

I think the writer _______ wrote the book is very creative.

Mr. Li lent me a book last week, _____I have learned a lot about earthquakes.

Every Monday morning, students in our school wouldstand at attention, watching the national flag .