He is a person to be depended upon, and won't let out your secret. In other words, he never ______ his friend.
---Tom hurt his left leg in the game this morning.---Really? It would take at least two weeks ______ he could recover and return to school.
His father insisted on punishing him, but he insisted he had _______ to do with the matter.
---Does Lucy enjoy singing? ---Yes, she does. I have never seen anyone else that is as ________ about singing as she is.
In order to ________ a good knowledge of English, he gave up his job and went to study in an English school.
It’s difficult for college students to have a train seat during holidays, so they are advised to make seat ________ well in advance.