Flight 551 for Dalas ______I must be off now— Have a pleasant trip then

Children under 12 years of age in that country _____ be under adult supervision when in a public library. [ ]

下列各句中，没有语病的一项是

下列词语加点的字，注音没有错误的一组是

The old man sat down and looked at me with a(n) _______ look on his face, which made me suddenly realize that I was still a helpful person.