On hearing a great noise, Mike looked forward through the window _____ what happened outside the room.
______, he still cannot make himself understood.
_________ is unknown to us all.
The village has developed a lot ______ we learned farming two years ago.
-----I hope to go to Beijing with you.-----If so,your holiday arrangement must________mine.
.-----How do you find the dictionary? -------It’s useful,_________for beginners of English.