By no means      true that all native speakers of English know their own language very well．

______________should be paid to our study,and only in this way ________make progress.

Only after the woman had her own child ___ how difficult it was to be a mother.

Europeans made ______ clear that they did not want to take the Romans as neighbors.

When _____ his view about his job as a teacher, Mike said he found it very interesting and rewarding.