He insisted that his plan _______ carried out at once. 

Look at the trouble I am in. If only I _____ your advice then.

—I didn’t attend the lecture yesterday.—I ______, either, if my mother hadn’t reminded me. 

-- Do you still remember when we went to Nanjing?--- I can’t remember now but _________ sometime last summer?

  The professor requested that all the students ________ the reports at once.