It’s very________ that, in many schools, the students are going to spend less time in doing homework than they used to .

Though great efforts have been      on their study , Annie still can’t make any improvements , which makes her parents greatly ______ .

 She explains English grammar ___clearly _____even I can understand it.

--- Do you know the Water Cube（水立方）at all? --- No, this is the first time I _________ here.

_______ good use of learning resources such as the website and library, and you will make great progress.