People _______ in the city do not know the pleasure of country life.
| A．live | B．to live | C．lived | D．living |
In recent years, with the help of our teacher, I have made_____ rapid progress in ____math.
| A．a; the | B．a; 不填 |
| C．不填; the | D．不填; 不填 |
Several weeks had gone by _______ we realized the painting was missing.
| A．as | B．since |
C．before | D．when |
Although _______ of danger, tourists can't help taking photos near the cliff.
| A．having warned | B．warned |
| C．warning | D．to be warned |
Many websites have been _______ to help people study foreign languages.
| A．put off | B．put up |
C．put away | D．put on |
---Can I join the club, Dad?
---You can when you ______ a bit old.
| A．get | B．will get |
| C．are getting | D．will have got |