Mr. Mike doesn’t understand ________ made his wife so upset this morning.
The population of this city, forty percent of which __________, __________ 15% in the last three years.
A good teacher should encourage his students to __________ the knowledge by themselves instead of just copying and memorizing what the teacher said in class.
—Could I ask you a rather personal question?—Sure, __________.
People try to avoid public transportation delays by using their own cars, and this __________ creates further problems.
The __________ look on his face showed that he hadn't expected it.