The scientists in China are trying __________ the ways to reduce the fog and haze (减少雾霾).
I don’t have ________ cups.
—Who ______ to join the music club? —I do.
Lucy sings very well. Many people love ______ her.
Maria likes documentaries ___ _ ___ cartoons, __ ____ she doesn’t like thrillers.
Frank is good at basketball and he wants to join the _______ to play it one day.