The lady walked around the shops, _______ an eye out for bargains.A keep B kept C keeping D to keep
—Can those________at the back of the classroom hear me?—No problem.
―Why? Where is my cellphone?―Dear me! You _______ it in the taxi!
You need some facts _____ to base your theory.
________ for not keeping his promise,Gary hung his head in shame.
BP announced Thursday that oil has stopped leaking into the Gulf of Mexico ,________ a few Americans think is untrue.