A. study B. to study C. studying D. studied
A. at B. in C. on D. with
A. affect B. effect C. effective D. affective
A. frequent B. busy C. regular D. usual
A. buy B. to buy C. buying D. bought
A. in B. on C. at D. by
A. In other word B. In another wordge C. In other words D. In other language
A. similarity B. equivalent C. note D. form
A. for B. of C. with D. to
A. instant B. constant C. distant D. important
微信支付 
支付宝支付