—We’ll have a hiking trip, but when shall we meet?--Let’s make it _____half past eight ____the morning of June 21.A at; in B./; in C./; on
He arrived____ London ____ a cold winter night.
When I walked past her room, I heard her _______ an English song.
Keep the machine _______, and you will know how it works.
—What was Tom doing _______ it was raining? —He was doing his homework in the bedroom.
Yesterday, a man said he saw _______ UFO in the park. The police are looking for _______ UFO now.