—— Have you seen___pen? I left it here this morning.—— Is it___black one? I think I saw it somewhere.
Most people are familiar with the idea that all matter in the universe ________ atoms.
Throwing their hats into the air, the fans of the winning team _____ loud shouts of victory.
It wouldn’t be ________ for us to attend a formal wedding with the sports clothes.
After the Shenzhou-9 manned spacecraft was successfully launched, Liu Yang became the first woman astronaut ________space in China.
The book didn’t _______ children because the author used two many scientific terms in it.