-Do you know how many counties_______ during his journey to Europe last month?-Quite a few. He was warmly welcomed by the countries' leaders.

My sister has a habit of keeping a diary and writes down ______ happens every day．

Sue told me that she ____________ shopping with her sister the next day.

Computers are so popular in our country that every pupil knows _____ e-mails.

I couldn't imagine ________ difficult it was for these badly injured victims to make it to the hospital.