26. The news that scientists so far haven’t found out the cause of bird flu discouraged some WHO officials,________?
| A．didn’t they | B．did it | C．didn’t it | D．did they |
The twins are so much alike that their own mother can hardly ______ them ______ .
| A．say; apart | B．tell; from |
| C．tell; apart | D．know; apart |
______ I remind you of is to return the book to our English teacher.
—I will give it to him ______ I see him.
| A．What； the moment | B．That； immediately |
| C．What； while | D．Whether; once |
______ the fire broke out, three fire engines were rushed to the spot.
| A．Hardly | B．Quickly |
| C．Immediately | D．Gradually |
Because the aircraft will finally end up in the water, it ______ be unsinkable and built entirely of environmentally friendly materials.
| A．can | B．may |
| C．must | D．Will |
—How is the cloth I chose?
—______ . This color will look very pretty on you.
| A．The color is too dark |
| B．You have very good taste |
| C．But the color is sold out |
| D．You can try it on now |