Do you have any idea________is actually going on in the classroom?
| A．that |
| B．what |
| C．as |
| D．which |
I don’t know who invented _______ telephone, it’s really _______ most useful invention.
| A．the; a | B．the; the | C．a; a | D．不填；不填 |
I would appreciate ______ if you could let me know in advance when the meeting will be held.
| A．that | B．this | C．it | D．you |
--- How did your students express their thanks to you on Teachers’ Day?
--- A gift, together with many flowers ______ sent to me by my students.
| A．is | B．are | C．was | D．were |
--- Why do you look sad?
---There are so many problems ______.
| A．remaining to settle |
| B．remained settling |
| C．remaining to be settled |
| D．remained to be settled |
--- What has happened here?
--- There was ______ accident here about an hour ago. ______ car hit a tree and ______ driver was killed.
| A．an; A; the | B．the; A；the | C．an; The; a | D．the; The; a |