—Look! He’s running so fast!
—Hard to______ his legs were once broken.
| A．know | B．imagine | C．realize | D．find |
I ________ thank you too much for all your help to my son while we were away from home.
| A．won't | B．can't |
| C．can | D．will |
No one ________ be more generous; he has a heart of gold.
| A．could | B．must |
| C．dare | D．need |
He did not regret saying what he did but felt that he________it differently.
| A．could express | B．would express |
| C．could have expressed | D．must have expressed |
—I left my handbag on the train, but luckily someone gave it to a railway official.
—How unbelievable to get it back! I mean, someone ________it.
| A．will have stolen | B．might have stolen |
| C．should have stolen | D．must have stolen |
They ________have arrived at lunchtime but their flight was delayed.
| A．will | B．can |
| C．must | D．should |