—Can I call you back at two o’clock this afternoon? —I’m sorry, but by then I______ to Beijing. How about five?
When the expression first came into being, people refused (拒绝)to use it but _____ they began to accept it.
Scientists say it may be five or six years _______ it is possible to test this medicine on human patients.
---Mike, please don’t forget to turn off the light when you leave. ---Pardon? ---I ________ forget to turn off the light.
It is so nice to hear from her. _______, we last met more than thirty years ago.
Could you tell me __________ the railway station?