She stepped on my foot _______, not _______, which made me angry

The constitution, unlike other forms of laws, is fundamental ______ our social system working properly[ ]

Where did you save the drowning girl, ________ parents were both professors?—It was from the lake ______ she often went fishing.

Beijing has ________ many buses that there is often a traffic jam in rush hours,

Did you get home a little earlier yesterday—No. It was six o’clock________ we got home.