He directed exposure to pigs,otherwise he_______pig flu.
| A．couldn’t get | B．wouldn’t have gotten | C．couldn’t have got | D．woud get |
.The wallet _______ several days ago was found _______ in the dustbin outside the building.
| A．stolen, hidden | B．stealing, hiding | C．stealing, hidden | D．stolen, hiding |
.Lessons _______ easily were soon forgotten.
| A．to learn | B．learn | C．learned | D．learning |
The ground is _______ with _______ leaves.
| A．covering, falling | B．covered, falling | C．covered, fallen | D．covering, fallen |
The library's study room is full of students _______ for the exam.
| A．busily prepared | B．busy preparing | C．busyly prepare | D．are busily preparing |
The scientists were waiting to see the problem _______.
| A．settle | B．settled | C．to settle | D．settling |