By the time I reach the age of sixty, I hope to be healthy enough to travel ___________ .

He speaks English well indeed, but of course not___________a native speaker.

It has been evident that too many children in the city are left ________ when their development requires parents’ close attention.

These people were mentioned at the meeting,           , Tom, Helen and Brown.

They’re ______ choosing a cautious policy in order to avoid a risk in such an important event.