I have notebook and two pens in my bag. notebook is for you. —Thank you.
Isn’t it time you _______ down to _______ your own things? —I’m sorry for the delay, Dad.
The life we were used to __________ greatly since 1992.
______ English is ______ useful language.
This is 3-D printer. And this is an artificial (人工的) ear. Can you believe that scientists printed this artificial ear by this 3-D printer?