_____, the environment of our city has been greatly improved.
. I told your friend how to get to the hotel, but perhaps I __________ have driven her there.
. —How’s your tour around the North Lake? Is it beautiful?—It __________ be, but it is now heavily polluted.
. —Where is my dictionary? I remember I put it here yesterday.—You __________ it in the wrong place.
. — She looks very happy. She __________ have passed the exam.— I guess so. It’s not difficult after all.
. The biggest problem for most plants, which ___ just get up and run away when threatened, is that animals like to eat them.