The teacher asked the students ________.

No product is allowed to go into the market if it fails to _____ the quality standard. [ ]

I lost the chance to take part in thesports meeting.—-_____________!

It is important to have your eyes examined regularly to check forany sign of eye disease that may not have any __________

_____ relation between China and Russia hasdeveloped steadily since Vladimir Putin was re-elected ________ president lastMay.