The first decade in the 21st century _______ the rapid rise of China as a world economic power.
| A．witness | B．has witnessed | C．will witness | D．have witnessed |
The number of people invited ____ fifty, but a number of them ___ absent for different reason.
| A．were; was | B．was; was | C．were; were | D．was; were |
In order to get good marks, he has changed his attitude ______ study.
| A．about | B．of | C．to | D．on |
There is no ____ that 100 years ago animal testing was cruel, but today animals in experiments are very well taken care of.
| A．point | B．wonder | C．use | D．doubt |
He was about to make a call to Tom _____ Tom patted me on the shoulder.
| A．as | B．until | C．while | D．when |
She wondered uneasily what use she would _____ this opportunity.
| A．made | B．make about | C．make of | D．make for |