—Who______ it be that is knocking at the door?—It ______ be Father, but I’m not sure.
To my ___, the short story has a lot of _____.
After a 68-hour flight in the Shenzhou VII spaceship, three astronauts Zhai zhigang, Liu Boming and Jing Haipeng returned to the earth _____.
They ___classes when the earthquake happened.
. ____in the mountains for a week, the two students were finally saved by the local police.
I don’t know ___tomorrow. Can you tell me?