请同学们用PR2019制作一个书写字片头、片尾效果练习的作业,要求视频中要用图片、音频和文字等基本素材,输出格式为720P的MP4

s.[Sydney promised her tht he wouldlwys donything he could for her to ________ of her hppiness. [ ]mking sure B．be sure C．being sure D．mke sureA．making sureB．be sureC．being sureD．make sure