18. ______changed，and whatever men can do，woltllen call do，too
A Age had B Ages have C．Times have D Time has
— I’m sorry I didn’t make it to your party last night.
—______, I know you’re busy these days.
| A．Of course | B．No kidding | C．That’s all right | D．You are welcome |
After he retired from the office, Tom ______ painting for a while, but soon lost interest.
| A．took up | B．saved up | C．kept up | D．drew up |
When the old man ______ to walk back to his house, the sun ______ itself behind the mountain.
| A．started; had already hidden | B．was starting; hid |
| C．had started; had already hidden | D．had started; was hiding |
The majority of visitors ______ in favor of his conclusion that the number of books published on the subject ______ simply surprising.
| A．were; was | B．was; was | C．were; were | D．was; were |
— The plane is due to take off at 8:00 from the airport.
— ______ we can’t get there in time?
— Try to take another flight then.
| A．As if | B．Even if | C．Only if | D．What if |