—China’s high-speed railway technology ________ the world now.
—That’s true. It has developed rapidly over the past years.
led
was leading
is leading
will lead
—_____ do you like science? —Because it’s interesting.
—You must _____ a letter to your mother tomorrow. —Well, I will, Dad.
—_____ does Kangkang meet his friends? —Four times a month.
Mr. Wang _____ gets up early. So he is ______ late for work.
—Shall we go to the amusement park right away or next weekend? — ______Any time will do.