.________ that he had wasted a lot of time, Tom decided to work hard on his study.
| A． Realizing | B．To realize | C．Realized | D．Having been realized |
The first prize goes to _______ makes the greatest contribution to the company.
| A．whomever | B．whichever | C．no matter who | D．whoever |
______ my camera wasn’t working; there is no battery in it.
| A．No doubt | B．No wonder | C．No possibility | D．No way |
–Better get down to your work, Tom.
--_________.
| A．It’s my pleasure | B．Don’t mention it |
| C．Mind your own business | D．You’re welcome |
—Got your driving license?
—No. I _____ too busy to have enough practice, so I didn’t take the driving test last week.
| A．will be | B．am | C．have been | D．had been |
The conference was attended by more than 11,000 people, _____ it the largest UN climate change gathering ever held.
| A．making | B．to make | C．made | D．to be making |