---Spacecraft “Discovery” has failed in the course of launch.
----_______? They have been preparing for the test.
| A．How come | B．When | C．How | D．Why not |
Someone called me up in the middle of the night, but they hung up ________ I could answer the phone.
| A．as | B．since |
| C．until | D．before |
She is getting better by degrees, but it will be some time _____ she is completely well.
| A．that | B．since |
| C．when | D．before |
They sat down opposite each other, but it was some moments ______ they spoke.
| A．after | B．before |
| C．since | D．when |
Mother asked me to take more money _______ something unexpected should happen.
| A．in case | B．so that |
| C．in order that | D．when |
________ I forget, please remind me about it.
| A．In case | B．So that |
| C．In order that | D．When |