11. The pilot, whether ______ or design, made the plane do a sharp turn.
30.It was_________ back home after the experiment.
29.An example of them is fraud, a crime _______ money is stolen by cheating others.
28. Dr. Frank failed many times but he finally _____ to find a successful way to solve the problem.
27.---Where have you been? ---I got caught in traffic, otherwise I _______ here earlier.
26.—May I ask a question after class,sir? —____,but not during my lunch break.