. A new technique ____, the production as a whole increased by % percent last year.
| A．employing | B．having employed |
| C．to have been employed | D．having been employed |
No one really knows exactly dfwhen the first people arrived in we now know as California
| A．what | B．when | C．where | D．which |
I'll bring some medicine just some of us get sick while travelling．
| A．As if | B．in case | C．even though | D．as long as |
—Have you found the missing?couple in the mountain ?
—No, but we hard to get in touch with them．
| A．have tried | B．have been trying |
| C．had tried | D．had been trying ． |
The average temperature in．Tibet has risen0.32 degrees centigrade every decade since 1961, according to the China Meteorological Administration,．
| A．to | B．at | C．by | D．in |
—On which day shall we go outing in the Qiagling Mountains, Friday, Satutiby or Sunday?
— is all right.
| A．Either | B．Both | C．All | D．Any |