—Mary, the telephone is ringing!
—______, but I am washing my hair.
| A．I’m sorry | B．You answer it | C．Hold on | D．That’s good |
________ I think he is Charles.
| A．Who do you think he is | B．Do you think who he is |
| C．Whom do you think he is | D．Do you think who he is |
The subject of "What is interesting is that I do not even know him." is_______.
| A．what | B．interesting | C．What is interesting | D．I |
Would you go and see ________ outside
| A．what to take place | B．what Tom has happened |
| C．what is happening | D．what the matter had been |
Do you know ________
| A．how many populations there are in the world |
| B．how much population there is in the world |
| C．how many the population of the world is |
| D．what the population of the world is |
Where do you think ________
| A．has he gone | B．has he been | C．he's gone | D．was he |