_____ these experiments were successfully completed would we think of
going into humans.
A．If only B．So that C．Only if D．Even if
According to the rules and regulations, all payments _____ be made in cash in the shopping center.
A．shall B．can C．must D．should
A huge amount of environmental damage has been _____ by the destruction of the rainforests.
A．brought up B．brought about C．brought down D．brought out
_____ her leg the last time, Brenda decided not to go on the school skiing trip this year.
A．Breaking B．Broken C．To break D．Having broken
Doctors strongly recommended that my father _____ more exercise regularly instead of sitting still before a computer all day long.
A．takes B．take C．took D．had taken
I went to that fancy restaurant with my wife yesterday, _____ chefs are really brilliant.
A．when B．which C．who D．whose
