__________ important for children __________ by themselves.
| A．That’s; to learn | B．It’s; to learn |
| C．That’s; learning | D．It’s; learning |
---_________ did your cousin leave his hometown?
---He _________ for nearly five years.
| A．When; has left | B．When; has been away |
| C．How long; has left | D．How long; has been away |
Mrs. Black isn’t used to _________ by sea and she used to _________ sick a lot.
| A．traveling; feel | B．travel; feeling |
| C．travel; feel | D．traveling; feeling |
The old man lives _________ in the country, but he doesn’t feel _________ at all.
| A．alone; lonely | B．lonely; lonely |
| C．alone; alone | D．lonely; alone |
---Must I return the dictionary today?
---No, you _________. You _________ keep it until next week.
| A．mustn’t; can | B．don’t have to; can |
| C．needn’t; should | D．don’t have to; should |
I’m not good at Maths, so I don’t know _________ out this difficult Maths problem.
| A．when to work | B．who to work |
| C．what to work | D．how to work |