28. Mr. Duncan raised an unnecessary question _______ he then failed to find an answer.
| A．with which | B．for which | C．to which | D．by which |
Your ideas are very interesting, but we need ______ suggestions to get us out of the mess.
| A．impressive | B．similar | C．traditional | D．practical |
To my understanding, a high school graduate has already reached a point in his/her life ______ he/she is supposed to make decisions of his/her own.
| A．which | B．where | C．how | D．why |
He is not native; if he were, we ______ this discussion over his identity.
| A．would not be having | B．are not having |
| C．had not had | D．will not have |
In those days our primary ______ was to provide people who were trapped in the snowstorm with food and healthcare.
| A．anxiety | B．concern | C．incident | D．doubt |
If you respect others ______ their economic background, you should be able to make lots of friends.
| A．according to | B．besides | C．regardless of | D．in terms of |