On April 16th, astronauts Zhai Zhigang, Wang Yaping and Ye Guangfu came back to Earth from the Tiangong space station ________.
widely
especially
highly
safely
Three fourths of the ________ in the country have run out.
I don’t know _________ the problem.
Hainan is a very good island. It’s the second ________ island in China.
The accident happened ________ a cold winter morning.
— ________ fine weather it is today! — Let’s go for a picnic.