Alight with no more power than ______ by an ordinary electric light bulb becomes intensely strong as it is concentrated to a pinpoint-sized beam.

A．Self-sufficiency is valued in the US.
B．If one child is unwilling to be responsible for his/her parent, he/she may be hated by his/her brothers or sisters.
C．Some children think that sending their parent to a convalescent hospital can be justified.
D．Actually, all children can contribute an equal share to the cost of their parents car

A．The secret to success in the garden is enjoying gardening.
B．The man doesn’t want to have such a dialogue again.
C．The man took the woman’s advice.
D．The man has plenty of trees in his yar