On April 16th, astronauts Zhai Zhigang, Wang Yaping and Ye Guangfu came back to Earth from the Tiangong space station ________.
widely
especially
highly
safely
In spring, it is good for you to sleep ________your windows open.
The students are _______ to know that elephants can walk quietly on tiptoe.
In spring, you will _______ the whisper of the breeze(清风),if you _______ carefully.
—____ girl in red is Millie 。 —Oh, What ___ nice girl!
—Could I swim here, Mr. Yang? —No, _____ . It’s dangerous to swim here.