So far no life has been found outside the earth, but while some scientists are actively searching for living things in outer space, others firmly believe there ____ .
| A．mustn’t be | B．may not be |
| C．can’t be | D．won’t be |
The police________his address and phone number in order to do further investigation.
| A．took off |
| B．took down |
| C．took in |
| D．took over |
He always brings me a pretty gift________he comes to visit me.
| A．by the time |
| B．sometimes |
| C．every time |
| D．at times |
The hotel itself can hold 100 guests and，________，there are several selfcooking apartments.
| A．in case |
| B．in addition |
| C．in particular |
| D．in fact |
Though she________for a moment，she finally went in and asked to see the dress that was in the window.
| A．dared |
| B．nerved |
| C．wondered |
| D．hesitated |
________that between 2000 and 2020，over 68 million people will die of AIDS in the countries most affected by epidemic.
| A．What is estimated |
| B．As we estimate |
| C．It's estimated |
| D．It estimates |