He is much richer than what he _____.
The “magical apple”, which we wish not to be the last one_____ us, has inspired the imagination and passion of millions of people.
Why the explosion occurred was ____ the laboratory attendant had been careless.
________ one foot before the other, slowly and purposefully, the deer walked up to ______ I was _______.
This field of scientific research remains________.
The teacher just took down the names of the students _______ during the exam.