When asked why he prefers bikes to buses, the professor said, “Riding a bicycle takes __________ half an hour, but it’s more convenient and environmentally friendly. ”
34. It may rain, but I shall go out _____.
33. Here is such a difficult text _____ none of us can understand.
32. Hardly ______ when the bus suddenly pulled away.
31. The room is in a terrible mess; it _______ cleaned.
30. Please write a notice for the students and ______ .