Johny , you ____ play with the knife , you ____ hurt yourself .
| A．won''t ; can''t | B．mustn''t ; may | C．shouldn''t ; must | D．can''t ; shouldn''t |
The new online library makespossible for students to choose books by smart phone off campus．
| A．it | B．one | C．that | D．this |
We were delayed at the airport．Otherwise，wehere by lunch．
| A．must have been | B．could be |
| C．should be | D．would have been |
According to the latest study，most traffic accidentsbe prevented if drivers are careful enough．
| A．must | B．can | C．have to | D．need |
He never complains about the difficulties he has in life．，he always has ways to overcome them．
| A．However | B．Otherwise | C．Instead | D．Therefore |
Jimmy managed to make a(n) profit out of the deal，for he had got such a good opportunity．
| A．handsome | B．pretty | C．attractive | D．beautiful |