—I'm a teenager's mother. Sometimes I don't know ____.—Maybe he suffers from stress.
Sometimes most of us probably are angry______our friends, parents or teachers.
—Which city is your favorite? —Hangzhou, of course. It’s the _____place that I want to visit.
On April 12, 1961,_____27—year—old Yuri Gagarin(尤里.加加林)became the first human to go into_____ space.
As young adults, it is our_____ to try our best to deal with each challenge in our education with the help of our teacher.
Please tell me________. I have some gifts for him.