The discovery was made in the 1950s, while the ________ of it was not recognized until half a century later.
| A．sacrifice | B．difference |
| C．significance | D．insurance |
—This returned Chinese scholar has become one of the top experts in this field .
—Yes , I know him very well . He in Africa with wild animals for eight years .
| A．has worked | B．had worked | C．worked | D．has been working |
Why is he always forcing his daughter to practise playing the piano if she is not for a pianist ?
| A．meant | B．intended | C．trained | D．asked |
—Would you tell me you want your tea , with sugar or milk ?
—Sugar , please .
| A．whether | B．when | C．what | D．how |
Carmen Ferreira up hope of finding her pet parrot , Raquel , who from the back garden of her house two years ago .
| A．has given ;disappeared | B．had given ; had disappeared |
| C．had given ; was disappeared | D．has given ;was disappearing |
A large crowd wildly as the pilot her plane safely in California .
| A．had cheered ; was landing | B．had cheered ; landed |
| C．was cheering ; had landed | D．was cheering ; landed |