Human facial expressions differ from those of animals in the degree ______ they can be controlled on purpose.

下列各组单词中，画线部分发音不同于其它三个的单词是______。

for a second,” the boy says, “______ thatmy father would come to my rescue.”

It was at the airport _____ was completed last year _____ he worked as a volunteer helping foreigners in need of translation service.

Sometimes I keep my feelings to myself it’shard for someone else to understand