根据首字母或汉语注释，在答题卡标有题号的横线上，写出空缺处各单词的正确形式。每空只写一词。

小题1:That house hidden a  ▲  the trees is my grandma’s.

小题2: It’s amazing m  ▲  are not afraid of cats now.

小题3:Air pollution has    ▲ （影响）a lot of people’s health.

小题4:I look much    ▲ （难看的）in the photo.

小题5:The policeman is    ▲ （控制）the traffic at the crossing.

在实验室里，欲使碱性溶液变成中性并能够清楚判断，下列试剂中最好选用哪一种组合(  )

①NaOH溶液 ②稀盐酸 ③石灰水 ④酚酞试液

A．①或③

B．只有②

C．只有①

D．②和④