The river ____are covered with trees is very long
A. which banks B. of which banks
C. whose the banks D. the banks of which
----I missed the first part of the film. It was really a pity．
----You _____home half an hour earlier.
A. should have left B. must have left
C. should leave D. must leave
It was at the very beginning____ Mr. Smith made a decision ___we should send for a doctor．
A. what，that B. that，which C. which，that D. that，that
A brilliant idea occurred to him, ___ to his research in the lab.
A. while devoting B. while devoting himself
C. while he was devoted D. while devoted
He started early _______he could get there before nine
A. in order that B. because C. so as to D. in order to
The policeman caught hold of the thief and hit him ____the head．
A. in the B. on his C. on the D. in his
