.________ a mobile phone can you ring ________ you want to talk with anywhere.
| A．Using; whoever | B．Only on; whomever | C．By; whatever | D．With; anyone |
I'm moving to the countryside because the air there is much fresher than _______ in the city.
| A．ones | B．one | C．that | D．those |
While watching television, _______.
| A．the doorbell rang | B．the doorbell rings |
| C．we heard the doorbell ring | D．we heard the doorbell rings |
Only after my friend came _______.
| A．did the computer repair | B．he repaired the computer |
| C．was the computer repaired | D．the computer was repaired |
He expressed a hope _______ he would visit China again the next year, and this was the very hope _______ he would express as soon as he arrived in the country.
| A．that; that | B．which; which | C．that; which | D．which; that |
Great changes have taken place in that school. It is no longer _______ it was 20 years ago, _______ it was so poorly equipped.
| A．what; when | B．that; which | C．what; which | D．which; that |