I listened to Professor Chen-Ning Franklin Yang’s lecture about his study and physics, but I failed to get its key ______ .

You call your mother’s sister      

— How far is your cousin’s home from here?— It’s about two ______ drive.

 — I have great _________ in finishing the work by myself. Could you help me?— No problem.

– Our teacher often tells us ____and make our class full of ______.-That sounds great.