What does the letter “o” in the word “mother” pronounce发音

_,I’d like to say how much I have enjoyed staying in your comfortable room.[ ]

These new books to the childen in the countryside in three days.

Sandy went to Tibet by train this summer for the firsttime. She had an unusual _________.

When we put the suggestion to him, he thought highly of it and was ______ about its immediate application. [ ]