I really can't understand ______ her like that.
The direction _______ which the president would go was kept secret ________ safety concern .
You needn’t take your shoes off when you enter someone’s house in Australia , _____ , of course , they’re very dirty .
--- Could I ask you a rather personal question ?--- ________.
At present the hotel is almost empty , but I’m sure things will start to _____ in the spring .
--- How much vinegar(醋) did you put in the soup ? --- I’m sorry to say , _______. I forgot .