—Must I turn off the gas after cooking? —Of course, you can never be ____careful with that.
. —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.
. My MP4 player isn’t in my bag. Where __________ I have put it?