This robot is supposed to save a lot of labor, but it remains a problem if it ______.

In recent years much more emphasis has been put______ developing the students productive skills.

The organization broke no rules, but ______had it acted responsibly.

Hedoesn'tknowwhattosay,foritisthefirsttimethathe______withagirl.

Under no circumstance _____ to tell lies to parents.