—Can we go camping tomorrow，as planned?—I'm afraid not.The dark clouds ________a heavy rain.

The keeper of the spring cleared away the leaves and branches, and wiped away the silt(淤泥) that would _______ have choked and polluted the fresh flow of water.

It’s ______ that the boy break away from the bad habit of sleeping at class.

Rain and high winds today _______ to take the place of yesterday’s mild conditions.

(2013·黄冈3月质检)—Do you know why Jane was so angry?—Her roommate gave in to ________ and opened the letter addressed to her.