1. Unfortunately, when I dropped in, Doctor Li _____ for Beijing to join in the fight again SARS, so we only had time for a few words.

  A. just left                     B. has just left     

C. is just leaving               D. was just leaving

2．He hasn't come yet．What do you consider _______ to him？

A．happens                       B．has happened      

C．happening                     D．to happen

3. ______ is known to us all is that China has launched Shenzhou V spaceship successfully.

A. That        B. What           C. It           D. As

4. —You've made great progress in your studies of English, haven't you?

—Yes, but much        .

A. remains to do                 B. is remained to do

C. remains to be done            D. is remained to be done