_____a written permission, he had to write another letter to the president of the university.
| A．Not giving | B．Not having been given |
| C．Having not given | D．Having not been given |
—Is the manager available tomorrow afternoon? —No, he is busy. Otherwise he ________ the meeting.
| A．had attended | B．would have attended |
| C．would attend | D．could have attended |
— Mum, where is my ball? I remember I put it here yesterday. — You _______ it in the wrong place.
| A．must put | B．might put |
| C．might have put | D．should have put |
On workday mornings I usually ________ an hour driving to work because of the traffic jam.
| A．spent | B．am spending | C．spend | D．will spend |
the website of China Daily, and you will learn more about it.
| A．Having searched | B．Search |
| C．Searching | D．To search |
____ has helped to protect the environment is worth praising.
| A．Who | B．The one | C．Anyone | D．Whoever |