China is a peace-loving country and _____no circumstances _____ first use nuclear weapons.
I really regret _______ to the party with you last night.
Asimov began having his stories ______ in science magazines in 1939.
It was ______ Asimov was eleven years old ______ his talent for writing became obvious.
—Sorry, I made a mistake again.—______. Practice more and you’ll succeed.
I’d like to ______ you _______ your success on the experiment.