Tom,you and I could hardly work out the mathematic problem, _______?
| A．could you | B．couldn’t I | C．couldn’t we | D．could we |
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 |
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 |
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 |
A growing number of people are beginning to believe that learning new skills and knowledge _____ more promotion opportunities.
| A．contributes to | B．refers to | C．devotes to | D．appeals to |
His interests extended _____ the fine arts to international politics and philosophy.
| A．across | B．through | C．over | D．beyond |