I should very much like to have gone to that party of theirs,but__________.
Only after my friend came ___________________________.
While ________ to foreigners,you must try your best to make yourself ________.
The computer system _____ suddenly while he was searching for information on the Internet.
about the journey, I was unsettled for the first few days.
Not only ______ strict with us, but also ______ for us .