It was half a year________my good friend returned to his hometown.
| A．before | B．since | C．that | D．when |
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 |
Although he knew little about the large amount of work done in the field, he succeeded ________ other more well - informed experimenters failed.
| A．which | B．that | C．what | D．where |
—Is the experiment easy?
— ________ . I’ll just do my bit.
| A．I think so | B．Certainly | C．Not a little | D．Anything but |