1. There are millions of books ___ every year in China. 
　A) publishing
　B) published
　C) been publishing
　D) to publish

2. There are many people ___ for the bus now. 
　A) to wait
　B) wait
　C) waiting
　D) are waiting

3. There are a lot of exercise books ____. 
　A) having to buy them
　B) we have to buy them
　C) having to buy
　D) we have to buy
　
4. In China, there are many beautiful places ____ to foreign tourists. 
　A) attract
　B) attracting
　C) attractive
　D) to attract

5. There is an important question _____ tomorrow. 
　A) discuss
　B) to be discussed
　C) discussing
　D) being discussed