—Jane, have you finished your paper?—No, I ________ my sister with her drawing all the morning.

—I say, Harry. What did you say to the laid-off worker just now? —Nothing. I ____ to myself.

—Thank goodness, you are here! What     you?—Traffic jam.

--- Did you telephone Uncle Sam our plan for the Christmas holidays on his farm?--- Yes, he was happy about our arrival, and he eagerly asked when         .

The first decade of the 21st century _____ the breathtaking and non-stop development of China.