The key to ___ new ideas is to observe daily life carefully, and not to take things for granted.
Look at this! It’s broken now! You ________ have been careful!
It was my sister ________ first had the idea to cycle along the entire Mekong River.
I’m surprised to hear from my school teacher again. ________, it is ten years since we met last.
My classmates insisted that I ________ the school field trip to Jilin.
—Miss Wang, I hear that you ________ for Beijing. Have you got everything ready? —Almost.