—Look at the flowers I gave you last month. They are dying! ________ do you water them?—Sorry, I forgot to water them.
I by my teacher’s home when I was back home last night.
She doesn’t like the book you are interested .
Sir, you should ________ at the red light, but you didn’t.
He hurried to the railway station for the last train but didn’t it.
The flight to Guangzhou had to be because of the heavy snow.