---- Thank you for having bought me a ticket for the World Expo in Shanghai!---- ________.
— Where is my English-Chinese dictionary? I put it on the desk yesterday. — You ___ it in the wrong place. A. must put B should have put C. might putD. might have put
I often think of the hours _______ I stayed with you, _____ has had a great effect on my life.
— Has your mother finished her paper yet? — I don’t know; she _______ it this morning.
Every morning, week in, week out, from dawn to dusk , he ______ his place on the bend.
It was in 1990 ______ the medicine was tested on human patients.