Until recently historians assumed that calendars ________ with the advent of agriculture.
| A．came to existence | B．came to existing |
| C．came to exist | D．were existential |
The two parties are holding the talk in a friendly________ at present. Hopefully，they will reach an agreement.
| A．atmosphere | B．condition |
| C．situation | D．phenomenon |
—The trip must have been terrible，wasn’t it?
—No.________，I enjoyed every minute.
| A．On the other hand | B．At one time |
| C．At the same time | D．On the contrary |
He has been acting strangely these days. I can’t________ his actions at all.
| A．account for | B．ask for | C．call for | D．stand for |
Prices of the basic necessities of life have been going up sharply since word came that war would________ between the two countries soon.
| A．watch out | B．break out | C．die out | D．give out |
—We don’t permit____ in our school. Would you please put your cigarette out?
—Forgive me. I didn’t know.
| A．to smoking | B．to smoke | C．smoking | D．having smoked |