I can't find my purse. I___________ it in the supermarket yesterday, but I'm not sure.
should leave
must have left
might leave
could have left
I was so familiar with her that I recognized her voice ______ I picked up the phone.
You have to wear a helmet and a life jacket for protection, just ___ you fall into the water. A. in case C. unless C. though D. As
I toured the Great Wall,I was deeply impressed with the beautiful scenery.
He was about to leave the office for home _______someone knocked the door and asked for some help.
If you find yourself ______ no one will help you, please call me.