Do you think this book is ______difficult for children to read ？

hat do you think of genetically modified food (转基因食品)? —We all think ______ is careless ______ some scientists to say it is safe before doing any experiment.

Xinghua is ___________ beautiful city. I like it very much.

Will you compete ______ the race? [ ]

How many students are there in your school?－_________the students in our school_________over two thousand.