— You don’t forget when we borrowed that reference book, do you?— I can’t remember now but ________ sometime last week?

 There was plenty of time . She ____ . 

—Did you arrive here this morning?—Yes,it was at nine o’clock ____we came here.

The experts present at the conference all insisted that greenhouse gas emission        be reduced from now on．  

I suggest that we ____ to the theater tomorrow, and I hope you can take my advice..