We believe ________ we can find out the wonder drugs to H7N9 bird flu.
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 _____.
If we _____ the other road, we might have arrived here in time for the meeting.