—Those scientists invented a robot to care for kids!
—It’s not surprising．They ____ wonders all the time．
| A．worked | B．were working | C．work | D．have been working |
＿＿ her hair getting gray, she has decided to have it dyed．
| A．As | B．For | C．With | D．Though |
The invention of artificial hearts marked a turning point in the battle heart disease．
| A．among | B．for | C．against | D．between |
Some people try to knock me down, only me more determined to do better．
| A．to make | B．makes | C．having made | D．made |
She removed hat she was wearing and tried on _____ black silk one．
| A．a; a | B．the; the | C．the; a | D．a; the |
Last year, the advertising rate _____ by 20 percent．
| A．raised | B．aroused | C．arose | D．rose |