. —Who____ it be that is knocking at the door? —It ____ be Father, but I’m not sure.
_____ I toured Zhang Jiajie, I was deeply impressed with its beautiful scenery.
After months of voyage, Columbus arrived in_____ later proved a new continent.
The door opened and in _____.
According to the Ministry of Health, by May 1, 2003, the total SARS deaths on the Chinese mainland_____to 170.
.---Tom, keep your_____ on your studies. --- Sure, mum. I'll keep that in_____.