When we put the suggestion to him, he thought highly of it and was ______ about its immediate application.
| A．curious | B．content | C．cautious | D．enthusiastic |
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 |
There were some chairs left over _____ everyone had sat down.
| A．when | B．until | C．that | D．where |
I used to love that film ______ I was a child, but I don’t feel it that way any more.
| A．once | B．when | C．since | D．although |