The _____ stuck on the outside of the envelope said "By Air".
| A．label | B．ticket | C．signal | D．sign |
Thanks to your help, ________ I would not have completed the task on time.
| A．however | B．because | C．so | D．otherwise |
The conflict had developed into a stage ______ the two countries were gathering big troops on the border.
| A．where | B．when | C．which | D．that |
The schools themselves admit that not all children will be successful in the jobs ______ they are being trained.
| A．in that | B．for that | C．in which | D．for which |
______ scientists know where a storm will happen, winds will suddenly change, carrying the storm to a new direction.
| A．Even if | B．Since | C．Despite | D．Unless |
When doing your history homework on the Civil War by typing in details to Google, a list of related books will ______ .
| A．come on | B．come up | C．come down | D．come across |