Mrs. White found her husband surrounded by letters and papers and ________ very worried.
| A．look | B．looks | C．looking | D．to look |
— 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 |
He looks very tired . He ____ to bed too late last night .
| A．must go | B．must have gone | C．could go | D．didn''t go |