33. The father asked the boy again, raising his voice a bit, but still ________ no reply.
| A．receiving | B．received | C．had received | D．to receive |
Barbie flue refers to the trend __________ young women dramatically change their appearance to make themselves look like human Barbie dolls．
| A．what | B．whether | C．that | D．how |
A wild Siberian tiger has been caught on camera in Heilongjiang Province, __________ the first images of this sort were captured．
| A．which | B．when | C．where | D．that |
Words failed me when I heard the news of the New Year’s Eve stampede in Shanghai. But for lacking a sense of safety, so many people __________ killed or injured．
| A．couldn’t be | B．wouldn’t have been |
| C．mustn’t have been | D．shouldn’t be |
Our nation should first develop modern law __________ in ruling the country by law．
| A．awareness | B．opportunities |
| C．regulation | D．principle |
__________ on Wechat is a common phenomenon, and more people hardly write letters．
| A．Communicate | B．Communicated |
| C．To communicate | D．Communicating |