－Why did you talk to the teacher after class?－I didn’t understand______________ during the lecture.

Do you know anything about the 31st Olympic Games– Yes. The Games ________ in Brazil in August this year.

The book written by Mo Yan is worth ______ a secondtime.

Is this the young engineer ________ you want to have ________ the computer for me

Few pleasures can equal ______ ofachieving your goal after hard work