______ a certain doubt among the parents as to the necessity of children's doing so much homework.
| A．It existed | B．There had |
| C．There existed | D．It had |
Shylock, how can you hope for mercy yourself when you show _____.
| A．it | B．nothing | C．none | D．no one |
The doctor couldn’t answer the question _____ the patient could survive that night.
| A．if | B．that | C．whether | D．what |
---I got up at five this morning, I thought it was Friday.
---You _____ so early. It is Sunday today; you don’t have to go to work.
| A．mustn’t have got up | B．needn’t have got up |
| C．needn’t get up | D．mustn’t get up |
He says he really can’t _____ to wait another day.
| A．waste | B．afford | C．spare | D．pay |
---I can’t recite the poem.
---Well, you are supposed _____ it many times yesterday evening.
| A．to read | B．to have read | C．reading | D．having read |