We shou
ld not let our grandparents who are too old and weak ________ alone.
| A．live | B．living. | C．to live | D．lived |
At the age of 14, Father had to leave school and start working. There would be no one to support the family _______ he not worked.
| A．did | B．has | C．had | D．was |
Having proper motivation is not _______ —it is another key to success.
| A．artistic | B．enterprising |
| C．investigate | D．optional |
Don’t worry. They ______ to consider your advice. Let me remind them of it now.
| A．could forget | B．could have forgotten |
| C．should have forgotten | D．should forget |
Before we go any ______, it’s important to make sure you understand what an interview is and why it’s arranged.
| A．far | B．farther |
| C．further | D．furthering |
Even more widespread _______ the copying of music and the pirating of software, especially with the development of new computer programs.
| A．is | B．does | C．are | D．do |