I am wondering ________ my invitation and join me for the trip to Hainan this summer.
— Would you like to talk with your father or mother, Liu Mei?— We don’t have the same topic(话题).
China has the _____ population in the world.
—David has made great progress recently.—_____, and _____.
—_____ you _____ your homework yet?—Yes, I _____ it ten minutes ago.
Now most families have only one child _____ our country’s one-child policy.