A．Have the right attitude．
B．Enjoy life．
C．Be optimistic．
D．Work hard．

A．It gives an important impression on others．
B．It has an impact on people around you．
C．It shows whether you are happy or not．
D．It is likely to be followed by other people．

A．The global crop production remained about the same．
B．Rice had the same yields as soybean around the world．
C．The wheat and corn production decreased everywhere．
D．Rice and soybean yields kept balanced around the world．