---Listen! Is Kitty in the next room? ---No, it ______ be Kitty. She has gone to Beijing.
I wanted to buy a comic book for my cousin,but there was_______ left in the shop.
The old lady has some problems_______her hearing.Please speak a little louder.
He never____learning English.That was why he was successful at last.
—Would you mind________the window?It’s a bit cold. —_________.
He explained________why he didn’t come to our party yesterday.