He ________ get into his own house because he has lost his keys.
| A．mustn’t | B．doesn’t have to | C．can’t | D．needn’t |
27. As five children under 10 got drowned in a southern province, it is not socially _____ for
parents to leave children unattended at that age.
| A．acceptable | B．affordable | C．sustainable | D．believable |
26. Google is testing a new television programming search service, _____ users to find shows videos from websites like Youtube.
| A．having allowed | B．allowing | C．to allow | D．Allowed |
25. It is only after my father was long gone _____ understand his deep love for me.
| A．I could | B．could I | C．that I could | D．when I could |
24. A growing number of people are beginning to believe that learning new skills and knowledge
_____ more promotion opportunities.
contributes to B. refers to C. devotes to D. appeals to
23. His interests extended _____ the fine arts to international politics and philosophy.
| A．across | B．through | C．over | D．beyond |