Whenever I go to Beijing, ____ is quite frequent, I will go to visit the Great Wall.
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.