John's success has nothing to do with good luck. It is years of hard work has made him what he is today.
—He _______ to the meeting. Have you informed him of it?—Sorry. I ________to.
It is not enough only________ the rules of grammar if you want to learn English well.
He________ the person referred to be put in prison.
______you I owe a thousand apologies ________ having doubted your ability.
______at in this way, the present situation about birds flue doesn’t seem so disappointing.