Jack _______ yet last night, otherwise he _______ me. A. mustn’t have arrived; must have phoned B. can’t have arrived; would have phoned
He got well-prepared for the job interview, for he couldn’t risk the good opportunity______.
_____from lightweight materials,the robots are about the size of a human arm or smaller.
The fact that smoking is harmful to health is____most smokers are quite aware of.
An example of them is fraud, a crime _______ money is stolen by cheating others.
Dr. Frank failed many times but he finally _____ to find a successful way to solve the problem.