There ______________ great changes in our hometown in the past fifteen years.

Tom, you didn’t come to the party last night?—I __________, but I suddenly remembered I had homework to do

Only then did I realize that it was foolish to ___ my friends and never contact them.

(2013·陕西高考)On Monday mornings it usually ________ me an hour to drive to work although the actual distance is only 20 miles

__ the office, the foreign visitorswere shown round the teaching building