Hurry up, kids! The school bus（） for us!
| A． | waits | B． | was waiting | C． | waited | D． | is waiting |
It was too hard for the firefighters to get close to the burning building．All their attempts to rescue the people trapped were .
| A．in vain | B．in return | C．in place | D．in danger |
---Is that the country clinic you often refer to?
---Right，just the one you know my father used to work for 10 years
| A．that | B．which | C．where | D．as |
Wait till you are more ________ . It’s better to be sure than sorry.
| A．inspired | B．satisfied | C．calm | D．certain |
_________ the internet is _________, I do not think it is a good idea to spend too much time on it.
| A．When ; helpful | B．As ; great help |
| C．While ; of great help | D．Now ; of no help |
Jack Ma(Ma Yun), CEO of ALIBABA.COM，first touched a computer in 1995, _______ he visited a friend living in Seattle.
A. where B. when C. on which D. that