By 2025, when the number of consumers worldwide has reached 4.2 billion, people with high income will be, for the first time, more than_______struggling to meet basic needs.
—The bookshelf fell down itself. —I know. Neither he nor you ____.
Only if you work hard _____, because hard work is the ultimate source of success.
The _____ look on his face suggested that the teacher was quite _____ with the result.
______, I came to realize that my parents could not always stand by me.
In my opinion, more attention should be ______ the environment, which is of great importance.