Studies shows that people are more __________ to suffer from back problems if they always sit before computer screens for long hours.
—Isn’t that Ann’s husband over there?—No, it ______ be him-I’m sure he doesn’t wear glasses.
The government tried its best to _____ the people’s needs, but the people were still not_______. In fact, what the government did was not________.
After the class was over,Li Ping apologized ________ the teacher ________ his coming late.
If the weather is fine, we’ll go. If ______, ______.
-Why does the river smell terrible?-Because large quantities of water______.