By the middle of the 21st century, the vast majority of the world’s population _____ in cities rather than in the country.
| A．are living | B．will be living | C．have lived | D．will have lived |
---I beg your pardon!
---Oh, you to me carefully. (just now)
| A．didn’t | B．haven’t listened | C．don’t listen | D．weren’t listening |
Where on earth have you been? We you back much earlier.
| A．were expecting | B．are expecting | C．had expected | D．expect |
He works in a factory now, but he on a farm for 20 years.
| A．worked | B．has worked | C．had worked | D．had been working |
Glad to see you back. How long in Russia?
| A．did you stay | B．have you stayed | C．were you staying | D．have you been staying |
---Have you decided already?
---Yes, I at once.
| A．have decided | B．decided | C．will decide | D．had decided |