To meet the challenge, the young people preferred _______ heavier work to do in their spare time.
A．to have  given |
B．to be giving | C．having give | D．to be given |
The doctor’s first reaction was a strange ______ of joy and anger.
| A．mass | B．mixture | C．collection | D．number |
As is known to us, the new minister will be ______ in office by the Queen.
| A．recognized | B．understood | C．confirmed | D．permitted |
______ is known to us all is that the 2016 Olympic Games will take place in Rio de Janeiro.
| A．It | B．Which | C．As | D．What |
What the teachers really doubt is ______ this student will get on well with the other students after he was caught stealing.
| A．whether | B．that | C．when | D．why |
--- May I use your mobile phone?
--- _________ .
| A．Why not? | B．Go ahead. |
| C．OK, enjoy yourself | D．Yes, but you’d better not. |