After years of wondering how the idle rich got even richer, we cracked the millionaire’s code, ______ secret is simple: Don’t spend a penny if you don’t have to.
A. which B. that C. whose D. what
Pollution has already destroyed much of the Earth. Only by changing ______ we live can we save our planet.
A. where B. how C. what D. why
The Hong Kong–Zhuhai–Macau Bridge (HZMB), is a 55-kilometre bridge–tunnel system ______ of cable-stayed bridges, an undersea tunnel, and four artificial islands.
A. consisted B. having consisted C. consisting D. being consisted
Give specific suggestions when you criticize others’ work. ______ comments do not help them improve.
A. Apparent B. Vague C. Concrete D. Various
The frequency of airline crashes is basically ______, but they do sometimes come in bunches.
A. random B. alarming C. countless D. steady
The great contributors in life are those who, ______ afraid of the knock at the door, still answer it.
A. if B. since C. though D. unless
