---Did you catch the first subway this morning?---No, I didn’t. It had started moving __________ I could get on it.
—Is your brother _______ TV?—No,he's _______ a book.
Listen,the girls ____ an English song.
Students in our school _______ know shouting in the library is not allowed.
Mother put a quilt (被子) _________ the sleeping boy to keep her warm.
China is a country ________ long history.