--I saw Betty go to Grandpa Li's home just now. --Yes. She’s often seen _________ the old man with the housework.. A: help B. to help C. helps D. helped
—The screen of your phone is big. —I like big screens.I _______ type fast on it.
—The game last night was so good. —Yeah! Our school team won _______ two points!
Growing evidence shows _______ exercising won’t protect us if we sit too much.
Don’t be afraid of failure.It is just _______ stepping stone to greatness.
The Twins Days Festival, _______ began in 1975, is the largest annual gathering of twins.