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 ...

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

15.??Susan is not very intelligent, ____ work very hard. A. not does she B. or does she C. either does she D. neither does she ...

7.??From the moment that an animal is born it has to make decisions. It has to decide which of the things around it are for eating, and which are to be avoided; when to attack and when to run away. The animal is, in effect, playing a compli...

2.??Anyone meeting Matthew Daniels for the first time could easily assume that he is the product of a conventional, even privileged childhood. With his well-spoken manner, his Ivy League education, and his business card reading "President, ...

17.??There are no seats ____ for those who are late for the show. A. available B. enough C. supplied D. make ...

8.??Don't risk ____ the chance which so many people dream of. A. losing B. to lose C. lost D. your life to lose ...

3.??The trip will be ____ till next week because of the bad weather. A. put out B. put off C. put on D. put up ...

15.??Then the girl came uo the stairs,helped me to my feet,guided me to the outhouse,and afterwards (escorted) me back to my bunk. A. carried B. accompanied C. saw D. helped ...

9.??"I have instructions from the Kommandantur to (settle an officer)in this house." A. receive an officer as a guest B. solve some disputes with an officer C. give an order to an officer D. let an officer live…as a lodge...