1.B 存在的有为there be,将来时为there's going to be,或there will be,一般用there's going to be,复数为there're going to be.have 是拥有,如：We are going to have a meeting this afternoon.
2.D need 在此用作情态动词,not直接放在need后面,然后跟谓语动词原形,need 也可作实意动词,后跟不定式to do,则答案为don't need to .
4.A send sb.to do sth.派某人去做某事,这儿用被动语态,be sent to表示被派往国外.
9.C 光速快于声速,属于客观真理,用一般现在时,且在宾语从句中不受主句时态的影响.
10.C by+表示过去的时间点,表示从过去的过去到过去为止,用过去完成时.
11.B since用于现在完成时,这儿是there be 结构,changes 又是复数,所以是there have been