The U. S．declares it has the best medical technology in the world，but quite a lot of Americans have no ____to health care service．

Have you heard that he, as well as his parents, ______ visited the Summer Palace? —Really?  No ______ he didn’t attend the meeting. 

There are certain _______when you have to interrupt people who are in the middle of doing something.

Your _____ as a student will be excellent if you develop a habit of reflecting on how you learn.

We have a lot of _____ at Senior High School, and at the same time the _______ in studying we have made is rapid.