——With 4G mobile phones, people can even see each other as they talk. ——Really? Would you show me it, please?
No matter how hard it is, just go on and never ____.
While you are doing math exercise, put a calculator(计算器) ____ to help you.
Here you are! This is one of the keys ____ the lock.
I can’t ______ Tom. He is a real idiot(白痴).
After three weeks she had got used _____ alone.