小题1:It’s reported that only two people survived this traffic accident.

小题2:He is determined not to let his parents down/disappoint his parents at all costs/at any cost.

小题3:It is generally believed that going on a diet is one of the effective ways of losing weight.

小题4:What matters is not what score you have got in the examination, but whether you have studied hard.

小题5:Having experienced great changes, people come to realize the importance of health food.

题目分析：

小题1:这句话用了句型：It’s reported that …“据报道…”，和动词survive“幸存”。

小题2:这句话考查词组：be determined not to do“决定不做…”，和词组： let sb down使某人失望，at all costs/at any cost.不惜任何代价。

小题3:这句话考查句型：It is generally believed that …据相信…，going on a diet是动名词做主语；还有词组 the effective ways of doing sth最有效的方式，lose weight减肥

小题4:考查主语从句：What matters 和两个表语从句what score you have got in the examination和whether you have studied hard.用not…but…连接

小题5:考查现在分词的完成式做状语：Having experienced great changes, “逐渐意识到”come to realize 。