At first Bob was puzzled by Virginia s waving, but then it _____ his mind that she was trying to tell him something.
| A．crossed | B．passed | C．occurred | D．opened |
The drug came under strong attack from _______ professional observers, who had been backed up by many doctors.
| A．confused | B．confusing | C．concerning | D．concerned |
---It’s supposed to rain tomorrow.
---I know, but the forecast ___ be wrong. Weather forecasts are far from 100 percent accurate.
| A．must | B．could | C．should | D．will |
She ignores the fact ____ there are two other channels, ____ we find very silly.
| A．that; which | B．that; that | C．which; which | D．which; that |
If someone has an accident and can no longer walk, scientists might be able to use stem cells to ___ the damaged cells and allow that person to walk again.
| A．rescue | B．remove | C．reserve | D．replace |
---Before you sign the contract, please read it as ________ as you can.
---Thanks for your __________.
| A．carefully; requiring | B．carefully; reminding |
| C．careful; requiring | D．careful; reminding |