__________ you understand the rule, you will have no further difficulty.
A. While B. Once C. Though D. Unless
— Shall I go and buy two more bottles of beer?
— No, I’ve already bought twenty. That _____ be enough for us two.
A. can B. may C. ought to D. might
No matter how frequently __________, the works of Beethoven still attract people all over the world.
A. performed B. performing
C. to be performed D. being performed
—What will you be doing at 4:00 tomorrow afternoon?
—I _____ in my office.
A. will be typing B. am typing C. am about to type D. will type
The school _______ he once studied in is famous.
A. where B. in which C. in that D. that
—Really ? Who will give ____lecture ? What is it about ?
—Professor Chen , ____president of Beijing University . About pollution .
A．the ;a B．the;/ C．a ; the D．a ;/
