The World Wide Web is sometimes jokingly called the World Wide Wait because it ________ be very slow.
| A．should | B．must | C．will | D．can |
The telephone _______, but by the time I got indoors, it stopped.
| A．had rung | B．was ringing | C．rings | D．has rung |
Though we don’t know what was discussed, yet we can feel the topic_____.
| A．had changed | B．will change | C．was changed | D．has been changed |
The moment I got home, I found I_____my jacket on the playground.
| A．had left | B．left | C．have left | D．was leaving |
The wet weather will continue tomorrow when a cold front ______ to arrive.
| A．is expected | B．is expecting | C．expects | D．will be expected |
—Have you known Dr. Jackson for a long time?
—Yes, since she________ the Chinese Society.
| A．has joined | B．joins | C．had joined | D．joined |