—Ann is in hospital.
—Oh，really？I ________ know.I ________ go and visit her.

I ________ in London for many years，but I've never regretted my final decision to move back to China.

In 1492，Columbus ________ on one of the Bahama islands，but he mistook it for an island off India.

When I got on the bus，I ________ I had left my wallet at home.(2011·山东)

The three of us ________ around Europe for about a month last summer.(2012·天津)

A lot of people often forget that oral exams ________ to test our communicative ability.

“Life is like walking in the snow，”Granny used to say，“because every step ________.”(2012·新课标全国)

(2013·北京，28)Hurry up! Mark and Carl ________ us.

The ___ look on his face suggested that he ____ so.

Yesterday, I came across my former classmate, but his name ________ me, which made me embarrassed.