Have you ever met with this case in your life you can't understand others even if they have said something several times?
.I ___ the English conversation yesterday evening.
The boy is tall enough to reach ___ the apples on the tree.
I am very ___ to you for your kindness.
—She is angry with me, isn’t she? ---______.
---May I have a copy of Lu Xun’s short stories? ---Certainly. ___.