By the year of 2053 there will be 487 million aged people in China, means that one third of the population will be over 60.
_____ the telephone number several times, but he couldn't learn it by heart.
It was five o’clock in the afternoon _____ they climbed up to the top of the mountain.
—Ready to quit guessing, Sandy? —No, no, I hold on! I think I _____ to the answer.
Put yourself in situations _____ you will be forced to communicate in English, and you will see more progress over time.
Dr. Johnson loves music but doesn’t like jazz and _____.