Hunger is _____ number one global health risk, so ______WFP has organized a lot of programmes, which targets people most at ________risk.
He asked me _____ finished my work.
He asked _____ for the computer.
The teacher told us that light _____ faster than sound.
Mr. Smith asked Nancy _____ it took her to fly to New York.
Mr. Green asked Lily whether she had passed the exam _____