I wrote down his name and address ______ I should forget it.

单项选择题Only twenty percent of the work（）done yesterday.

A. has
B. was
C. have
D. were

单项选择题He tried many times to sneak across the border to a neighboring country,（）caught each time.

A. having been
B. only to be
C. always being
D. unfortunately

单项选择题All（）has already been done.

A. can be done
B. should be done
C. that can be clone
D. what should be done

单项选择题Neither he nor I（）from Canada. We are from Australia.

A. is
B. are
C. am
D. be

单项选择题It is chairman of the department ______ the teaching staff elected him.

单项选择题I prefer ______ there doing nothing.

单项选择题It is foolish ______ such a mistake.

单项选择题No sooner had we reached the top of the mountain ______ we all sat down to rest.

单项选择题Neither Mary nor her brother ______ good at singing.

单项选择题I don't think it advisable ______.