Joy, what happened to the plane? It ___ at midnight, but it didn’t land on the airport on time.
-Who’s that? -________
The boy _______ a blue jacket can sing songs _______ English.
书写时占三格的字母是______.
“中华人民共和国”的缩略词是______.
下列字母含有相同元音音素的一组是 ______.