Lighting the dark sky for a few seconds.

Prior to the formation of a tornado,_________. A: the sky is cloudy B: the sky is very dark C: the sky is cloudless D: a black line stretches across the horizon

There are dark clouds in the sky; it looks as if it _______. A: would rain B: rained C: had rained D: is going to rain

47. The dark clouds in the sky suggested that it ____ soon. A: rain B: would rain C: should rain D: is going to rain

The International Dark-Sky Association means to protect the darkness of the night sky.

You’d better stay at school now. Look! The sky is overcast with dark clouds. I’m afraid () rain is going to fall. A: large B: big C: great D: heavy

Given the following scripts， what output would be generated？（） A: The sky is red. B: The sky is blue. C: The sky is green. D: The sky is yellow.

The ancient people believed that ______. A: the earth was spinning on the axis of the sky B: the sky was a hollow sphere spinning around the earth C: the patterns of stars on the sky would never change D: the stars around the sky were not stationary

______ he realized it was too late to return home. A: No sooner it grow dark when B: Hardly it grew dark than C: It was not until dark that D: Scarcely it grew dark there

__________he realized it was too late to go home. A: No sooner it grew dark when B: Scarcely it grew dark than C: Hardly it grew dark than D: It was not until dark that