在下列各句的空白处填入一个最恰当的单词，使句子意思完整，语法正确。(5分)
26．一What ___________ do they speak? 一They speak Japanese．
27．Peter works in a big restaurant．He is a__________．
28．He doesn’t want to be a policeman，because it’s very _________．
29．Thanks a lot ___________ giving us so many books and nice toys．
30．There are a lot of beautiful __________ in Hawaii(夏威夷)in the US