If we go on using energy so wastefully, __________ are that our oil wells will be dried up before new energy sources can be found to replace oil.
| A．chances | B．opportunities | C．questions | D．problems |
. Mary is barely a diligent girl, as it is the fourth time she has been sleeping in class, ________?
| A．is she | B．isn’t she | C．isn’t it | D．hasn’t she |
. Brian told you that there wasn’t anyone in the room at that time, ________?
| A．was there | B．wasn’t there | C．didn’t be | D．did he |
. I think she always disagrees with him, ________?
| A．do I | B．don’t I | C．does she | D．doesn’t she |
. – Don’t forget to come to my birthday party tomorrow.
– ________.
| A．I don’t | B．I won’t | C．I can’t | D．I haven’t |
. – Do you think it’s going to rain over the weekend?
– ________.
| A．I don’t believe | B．I don’t believe it |
| C．I believe not so | D．I believe not |