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 |
.（上海卷28）. Every few years, the coal workers.their lungs X-rayed to ensure their health.
| A．are having | B．have | C．have had | D．had had |
.（浙江卷15）. For many years, people __ electric ears. However, making them has been more difficult than predicted.
| A．had dreamed of | B．have dreamed of | C．dreamed of | D．dream of |
（浙江卷5）. ff you plant watermelon seeds in the spring, you __ fresh watermelon in the fall.
| A．eat | B．would eat | C．have eaten | D．will be eating |
（重庆卷31）.— Why do you want to work for our company?
—This is the job that Ifor.
| A．looked | B．am to look | C．had looked | D．have been looking |
（重庆卷29. The palace caught fires three times in the last century, and little of the original buildingnow.
| A．remains | B．is remained | C．is remaining | D．has been remained |