She said she was unlucky _______ the train, and had to spend another day here.
Helping others is a habit, you can learn even at an early age.
Vitamin D helps our bodies make a special chemical, and this special chemical, ________, affects our brains, making us feel happy.
Don’t worry about the child. Next to him ________ a lady, _______ he can turn when he is in trouble.
The girl had hardly rung the bell the door was opened suddenly, and her friend rushed out to greet her.
——How did you like Nick’s performance last night? —— To be honest, his singing didn’t to me much?