—Peter, where did you guys go for the summer vacation?—We ____ busy with our work for months, so we went to the beach to relax ourselves.
Make sure the gas is turned off after a bath, which would ________ cause danger.
Bats are surprisingly long-lived creatures, some ________ a life span of 20 years.
We won’t ______ you ______ away with cheating in the exam.
The surgeon suggested that he __________ at once.
Great changes have taken place in that school. It is no longer_____ it was 20 years ago,__________ it was so poorly equipped. A. what; when B that; which C. what; which D. which ;that