— What do you think of the White House?
— Splendid. While I was studying in America, I it twice.
A.have visited B. had visited
C. visited D. would visit
Everyone has periods in their lives everything seems very hard.
A. which B. where C. that D. when
—Do you know Lily has gone to London?
—Oh，________I haven't seen her these days.
A.no doubt B．no wonder
C．naturally D．of course
Jane is an honest girl；I say it，________I don't like her.
A．even though B．as if
C．as long as D．as though
Six people were killed in the riot(暴乱)，a policeman________.
A．include B．included
C．including D．to be included
He tried his best to solve the problem，________difficult it was.
A．however B．no matter
C．whatever D．Although
