72. We couldn’t read the notice on the board because several people were standing _______ it.
| A．in front of | B．in the front of | C．at the back of | D．in back of |
We don’t think the experiment is ______ failure. At least we have gained ______ experience for future success.
| A．the; a | B．a; / | C．a; an | D．the; the |
—Do you think you will be able to finish your writing by five o’clock today?
— ______. I’ll be busy with experiments all day.
| A．Not a chance | B．Not a little | C．Not to mention it | D．Not a big deal |
To make a string picture, first draw the outline on a card, then spread the glue _____ you want to attach the string,
| A．to which | B．on which | C．where | D．that |
One advantage of eating a balanced breakfast is ______ it can keep you energetic throughout the day.
| A．when | B．how | C．that | D．whether |
I think that's unlikely to happen, but if that ______ occur, both America's and China's interest would be severely damaged.
| A．should | B．could | C．would | D．might |