Some countries are rich, others are extremely poor.
| A．while |
| B．as |
| C．unless |
| D．when |
—How many photos have you taken?
—I’ve taken 60 ________. I’ll take more.
| A．in general | B．in return | C．in total | D．at all |
With the popularity of network, email has largely ________ the traditional letter.
| A．exchanged | B．removed | C．expanded | D．replaced |
Many students, ________ some pocket money and social experience, work during their holidays.
| A．to get | B．having got | C．getting | D．got |
He likes books ________ science because he wonders what and why our world is.
| A．relating to | B．related to | C．connecting to | D．connected to |
You ought to have a good rest ________ you’ve finished your painting.
| A．even if | B．when | C．now that | D．as long as |