— Shall Mary come to the concert with us？
－Not_____she has finished her paper．
| A．since | B．once | C．when | D．unless |
At that time I had no idea ________ I could hand it to him without being seen.
| A．if | B．how | C．which | D．that how |
Now there is a danger ________ the ground may fall in under the heavy traffic.
| A．whether | B．if | C．X | D．that |
We think it possible ________ the local government will be able to solve the housing problem.
| A．for | B．that | C．when | D．how |
She took it for granted ________ I'd be back home an hour ago.
| A．that | B．whether | C．if | D．when |
I asked her in English ________ she was, and she told me ________ she was an actress.
| A．who…that | B．who…X | C．what…X | D．how…that |