23. ––Was ______ problem solved?
––We were trying to think of ______ way out, but it was difficult to find one.
| A．a; a | B．a; the | C．the; a | D．the; the |
Up to now, large quantities of food ____ to Africa to save the starving people.
| A．is sent | B．has been sent | C．have been sent | D．are sent |
---Why did you stop writing?
--- I _____ my writing paper.
| A．ran out of | B．have been used up |
| C．have used up of | D．have run out |
The building _____ Rome times has been rebuilt recently.
| A．dates back to | B．date from | C．dating back to | D．dated from |
President Obama declared America was not and never would be ____ war _____ Islam.
| A．on; in | B．at; in | C．with; at | D．at; with |
He requested that all the soldiers _____ the news secret.
| A．keep | B．kept | C．keeping | D．to keep |