At present, 1 in every 10 people is aged 60 years or older, ______ in 2050, 1 in every 5 people will be aged 60 years or older.
At the meeting they discussed three different _____ to the study of maths.
The bald eagle_____ the United States.
It was difficult to guess what her _____ to the news would be.
—How do you _____ to her unkindly behavior? —Only silence. Which of the following is wrong?
If his parents are convinced ______ the fact that his son always focuses his mind _______his study.