I listened to Professor Chen-Ning Franklin Yang’s lecture about his study and physics, but I failed to get its key ______ .
—_______do you go shopping? —Twice a week.
I am a student. I usually _______at 4:30 p.m..
I hope his dream ___________true.
Which word makes the sound /wɪtʃ/?
Which of the underlined part has a different pronunciation(发音)?