4.To create a supercell, take a storm where wind speed increases with height, while wind direction veers; a situation in which updraughts and downdraughts within the thunderstorm can support each other's existence rather than cancel each ot...

23.He used to get up late, ____ A. did not he B. did he C. didn't he D. use he ...

11.To make up an objective test, the teacher writes a series of questions, ____has only one correct answer. A. some of which B. each of which C. which D. that ...

5.His carelessness ____ her failure in the exams. A. resulted from B. resulted C. resulted in D. resulted to ...

12.Let's address the question of whether speed reading is even a desirable goal. I am an avid fiction reader. Consciously or unconsciously, readers of fiction appreciate the beauty in good writing. Occasionally I will read a passage or sent...

6.Yhudi Menuhin, who died in Berlin on March 12, 1999, at the age of 82, was a child prodigy who fulfilled his promise to become one of the world's foremost violinists before extending his range to teaching and conducting. The gently spok...

14.He had carried messages and acted as (lookout). A. person sent to attract enemy's attention B. person assighed to protect the message C. person assigned to be on the watch D. person sent to set up sighposts ...

8.Surely a (telltale hole )in the melted wax would expose the end of the metal capsule concealed in the base of the candle. A. a hole that revealed the secret B. a hoel that was able to tell a story C. a hole that was able to b...

2.While death might (beckon)at any time,its dark shadow came directly into their home sometime after dusk every Thursday. A. make an unnoticed departure B. make a signaling or summoning gesture C. make a sudden dash D. mak...

12."Another gray day,gray and gloomy,"she muttered,though really the rain was more than welcome after last year's (drought). A. lack of rain B. heavy storm C. strong wind D. heavy snow ...