On Sundays there were a lot of children playing in the park, and _______ parents were seated together joking.
| A．their | B．whose |
| C．which | D．that |
— 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．spended | 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 |
—Why didn’t Tom go to the concert last night ?
— I have no idea,but I think he _____ in his study.
| A．read | B．have read |
| C．was reading | D．would read |