Thenew aircraft has performde very well in its _tyial.
A. first
B. second
C. core
D. initial
Sydney set a goal to reduce carbon emissions by 5%.
A. 对
B. 错
Now my house is less drafty and it helps a bit with the gas bill.
A. 对
B. 错
T he incident left enduring traces on his mind.
A. 对
B. 错