The boy_______ play with his mother's iPad very well when he was only three.
The Yellow River is the second _______river in China.
Everybody is here ________ Tom , because he is ill in hospital .
.Traveling by plane is the most comfortable , but it is also the _________ .
I want to go to Beijing _______ because I can see the beautiful scenery all the way .
The sun is __________ the earth .