My grandfather is always thinking for others. In another word, he is always ________.

— Jack has spent an hour in the shoe shop．Hasn't he decided which pair of shoes to buy?— Maybe．Young as he is, he is         about his appearance．

As to the subject, we have consulted the most _______ professor who gave us _______ explanation.

We were          at what he said．

Of these two teams above, the former comes from the US; the _________ comes from England.