— You’ve dropped ________ “s” in the word “necessary”.— Oh, ________ letter “s” is doubled.
Stephen Hawking thinks _______ important to have hope in bad situation.
Robert is away. He _______ America since last week.
—Why are you packing so many books? —I’ll _______ to the kids in West China.
My Old Classmate also mentioned some important events that _______ from 1993 to 2013.
—I had a really good weekend at my uncle's. —_______.