Look at the terrible mess! You _________ cleaned the house before I came back.
A. should have
B. must have
C. will have
D. had
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With the population explosion, scientists will have to ________ new method of increasing the world's food supply.
A. carry out
B. comd up with
C. put forward
D. give out
________ there was not enough evidence; most people still thought the crime was guilty.
A. Because
B. Even though
C. If
D. Unless
________, we'll go swimming this weekend.
A. It being a fine day
B. As it is a fine day
C. Being a fine day
D. The day will be fine
_______ absurd was his manner that everyone stared at him.
A. Much
B. Too
C. So
D. Very