So far, several cases of a disease, as bird flu, are reported to have been found in the country.
| A．knowing | B．to be known | C．having known | D．known |
Parents and children should communicate more to __________ the gap between them so that they can understand each other better.
| A．open |
| B．narrow |
| C．widen |
| D．leave |
Though __________ to see the strangers, the housewife gave them a big smile and said hello.
| A．surprising |
| B．to be surprised |
| C．surprised |
| D．having surprised |
__________，he will not take off his coat.
| A．However it is hot |
| B．However hot it is |
| C．However hot is it |
| D．However is it hot |
People from all over the country __________ they are old or young, rich or poor, are doing whatever they can to help the sufferers in the earthquake-stricken area.
| A．even if |
| B．whether |
| C．no matter |
| D．whichever |
If we work hard with a strong will, we __________ overcome any difficulty，__________ great it is.
| A．must; however |
| B．need; whatever |
| C．can; however |
| D．will; whatever |