You leave your kid alone at home. It’s very dangerous.
The math problem is so hard, I really don’t know _____.
--- Shall we call a taxi?---- Ok, Let me ______ the phone number in Yellow Pages.
_____ there may be sharks near the beach, people still swim there.
The school isn’t far ________ my home. It’s just ten minutes’ walk.
Wherever he meets a new word, he will _____ in his English dictionary.