Shall we listen to Sun of the Season again— Yes. How soft and beautiful it _______!

Air pollution is getting more and more serious，so we must take action________it is too late.

The Yellow River is the second ______one in China.

The pen I _____ I_______ is on my desk, right under my nose

nds of years ago peoplediscovered the phenomenon by chance, and this was _____ the idea of the compassfirst came from