It was essential that the application forms ___________ back before the deadline .
| A．must be sent | B．would be sent |
| C．be sent | D．were sent |
The scientific research on how to protect the rare animals is ________. Many scientists are working hard to find new way to raise the animals by man.
| A．in danger | B．in control | C．in order | D．in progress |
Michael __________ here to see you and he____________ a note on your desk.
| A．has come; had left | B．has been; has left |
| C．has come; left | D．has been; left |
—Grace, when shall we take a walk?
—After I finish________ the dishes.
| A．wash | B．washing | C．washed | D．to wash |
I really wonder____ he has posted me many parcels_____ we didn't work together.
| A．how ,after | B．why, when | C．when, before | D．why, since |
— How come a simple meal like that costs so much?
— We had ______in your bill the cost of the cup you broke just now.
| A．added | B．included | C．contained | D．charged |