．The conference aims to develop business and let people think about ______ they can have a positive influence on the planet．
| A．why | B．that | C．what | D．how |
The money was soon spent , so he ____ go hungry .
| A．must | B．had to | C．might | D．should |
— Would you open the window , please ?
— Yes , I ____ .
| A．will | B．would | C．do | D．can |
I''m surprised that he ____ to help me when I needed his help .
| A．should refuse | B．would have refused |
| C．should have refused to | D．may have refused |
A lion ____ only attack a human being when it is hungry .
| A．should | B．can | C．will | D．shall |
If you ____ me , I''ll give you some advice .
| A．listened to | B．will hear | C．will listen to | D．will listen |