So difficult ____ it to live in an English-speaking country that I determined to learn English well.
---She might complain about you to the manager. ---_________? I know I am in the right.
— What do you suppose ______ her look so upset?—______ by her boyfriend again.
This kind of glasses made by experienced workers _______ comfortably.
Your window wants ________;you’d better have it ______ this week.
Between the two parts of the concert is an interval(休息时间), ______ the audience can buy ice-cream.