Don’t _______ your breath trying to persuade them; they’ll never listen.
| A．use | B．waste |
| C．spend | D．put |
What _______ public is concerned about is whether medical workers and scientists will be able to find _______ cure for this new disease after the vaccine is tried on _______ volunteers.
| A．不填; 不填; 不填 | B．the; the; 不填 | C．the;不填; the | D．the; a; the |
Because of the Russian gas limit to Europe, attempts _______ to use botanical fuel as a source of power.
| A．have made | B．having made | C．are being made | D．will be making |
Chinese exports have been hit hard by falling world demand, with millions of workers _______ to their villages after the factories that employed them closed down.
| A．returned | B．returning | C．have returned | D．return |
There would be not a good harvest of wheat in North China this year _______ the big snow.
| A．in spite of | B．apart from | C．due to | D．in case of |
Yao Ming, a NBA superstar, became the boss of Shanghai basketball team, and is ready to _______ in new world of basketball.
| A．take off | B．get off | C．turn off | D．come off |