s experiment, the famous professor showed three different ________ to the study of physics.

led Hnnah many times yesterday evening, but I couldn’t get through. Her brother _________ on the phone all the time!

He was appointed _____ a very important post in the West, where he would improve himself better

A has beautiful feathers . And it can sing nicely.

That Japan made an attempt to ______ the Diaoyu Islands has aroused the anger of all Chinese people because they have been China’s since ancient times.