Historical experience can ____ as a most important source of information.
—Why do you eat so little? Mind your health. —Oh, please don't be __________ about me. I'm just __________.
Can you name some illnesses __________ with smoking?
We noticed a cat __________ towards the big tree and disappear last night.
In the second type, the shark pushes you with its nose to find out if you are fit __________, and then bites you if it thinks you are.
When you go to Hangzhou for travelling, you'd better take an umbrella because it rains __________ there.