There were dirty marks on her trousers _______ she had wiped her hands.
______ you make a promise, you should keep it.
My parents insisted that I _____ medicine instead of law.
________ was it that made the singer ______ his Asia Tour Concerts.
He ______ his sister to give up the plan for cycling along the Mekong River, but failed.
_______, the examination tomorrow has been cancelled (取消).