______ do you go hiking? — Once a month. [ ]

makes the peasant worker proud is he has set up a new bridge for the villagers.

Excuse me, where are we going to have our class meeting?—I’m not sure. Ask Li Hua, please. He _________ know.

Tom, where is your father?- I’m not sure. He _______ in his office.

Can you _________ who has taken it away?