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 |
Other genetic similarities suggested they all ________ a single, common ancestor about 300 years ago.
| A．had | B．have had | C．have | D．had had |
The managers consider it is important that everything ________ by weekend.
| A．will complete | B．has completed |
| C．be completed | D．is completing |
—Your sitting room looks so clean and tidy.
—Well, thanks to the babysitter. She is a real ________.
| A．finding | B．invention | C．find | D．discovery |
Don't worry about my illness. What I need is ________ but a few days' rest.
| A．anything | B．everything | C．something | D．nothing |
You surprise me! You ________ fall asleep in such an important meeting.
| A．must | B．may | C．can | D．should |