th credit cards ________ available, it is more frequent to see consumers pay for their purchases or bills by card instead of by cash.

Tom , would you please help me get some chalk — __________ . What color do you want

He has devoted most of his time and energy _______ a cure for the disease.

Kelly is good at singing. She sings ________ the famous singer, CoCo.

______ the aids from the outside, the positive attitude of the disaster-stricken people _____ the key role in the reconstruction of their destroyed towns and villages[ ]