Nancy spent half an hour _______ playing the piano every day.
Li Wen’s parents took a 24-hour train and a 5-hour bus ride ______ to his school.
Keep away from smoking, please! It’s bad for our health, for the students!
Thomas was _______ excited at the exciting news that he could hardly say a word.
— We are going on a travel to Qingdao in six days. — .
Thanks to the computers, we do not have to spend a lot of time ________ boring numbers and information.