He said he would arrive before seven, and _____. [ ]

y a meteorological observatory _____ air quality in urban areas from one to five:excellent, fairly good, slightly polluted, poor, and dangerous.

You can’t reach_______ something_______ someone’s plate. —OK, I won’t.

He ______ busy yesterday, or he ______ you with yourexperiment.

Can you explain ______the OPEC can have such total control over the price of oil