一1. It is likely2. When he finished (要注意时态,前面有人用的finishes是错的)3. has been back4. got on (这里的went on board是指上飞机这个过程动作,而前面有人用was on,就变成了已经在飞机上这个状态,所以是错误的)二1. in temporary care of2. think about (前面有人用think over,可是需要写成think it over,所以不符合题目)3. put the book back, can't be found.4. inquired into, it happened5. when, showed up (前面有人用arrived in,但是需要加地点才对,也有人说arrived there,但是上下文没有说there,here,所以需要用一个showed up,不必牵涉到上下文)6. did researches, a base (做研究要用do/did,如果用make/made就是错的)7. burst into laughter (burst的过去式和过去分词都是burst,没有bursted,所以前面有人的答案是错的。)