Apple CEO Steve Jobs died of cancer in October, 2011, ______ made most people sad.
| A．who | B．which | C．when | D．what |
he field research will take Joan and Paul about five months; it will be a long time _______ we meet them again.
| A．after | B．before | C．since | D．when |
He was told that it would be at least three more monthshe could recover and return to work.
| A．when | B．before | C．since | D．that |
It is difficult for us to learn a lesson in life ____we’ve actually had that lesson.
| A．until | B．after | C．since | D．when |
---Where’s that report?
---I brought it to you ________ you were in Mr. Black’s office yesterday.
| A．if | B．when | C．because | D．before |
Don’t promise anything ______ you are one hundred percent sure.
| A．whether | B．after | C．how | D．unless |