The teacher said that they ______ hard-working students.
All of us went to the park _______ Bob. He had to look after his sister at home.
. Jim has _______ friends here, so he often stays at home and feels lonely.
—Is your ipad white, Mandy? —No, it isn’t. _______ is black.
—Do you know _______ man in jeans?—Yes. He’s a professor of _______ university.
--- MH Flight 370 has been lost for nearly three months.--- What a pity! I wonder___________________.