--- Ten dollars, please! --- How terrible! I ____ to bring my wallet with me. A was forgetting B had forgotten C forgot D am forgetting
Wouldn’titbe______wonderfulworldifwecouldlivein______peace?
—Why did Sarah cry just now? — She wanted a toy, _____ I can’t afford.
You’d better keep ______ when I take photos for you.
I can’t afford _______ car.
He is known _____ a scientist and famous _____ his research on rice.