Little did the teacher imagine that a student good at maths _____ have failed in the exam.

Why do you like P.E.— _____ they’ re fun.

Just as the clothes a person wears, the food he eats and the friends with whom he spends his time, his house _____ his personality. [ ]

The cost of buying a house in Beijing is much higher , but Beijing is _______in traffic.

The more people he helps, _______ he feels.