Two years later,her father disappeared,never________again. [ ]

With the _____________ of science and technology, people can talk with each other much more conveniently than before.–But China is still a __________ country, people have to work hard to live a better life.

The __ Winter Olympics will be held in Pyeongchang(平昌)，South Korea on Feb. ____, 2018.

We can make a fire ______ the room warm sothat we can chat for a while.

It takes more than knowledge andintelligence to ______ a good researcher．