Darren ___ the huge stone animals liningthe passage.

When she got home, the first thing _______ she did was to clean the house.

E-shopping,when properly _____,can save us a lot of time and energy[ ]

To those scientists, it still remains to be a question ______ man can go back to the old days with time machine

Four o’clock in the morning?-What? Oh, no, don’t ring me up that early. I ________.[ ]