Tom must have been in his girlfriend’shouse on Christmas Eve, ________—– ___________．He was seeing a film all nightlong with us ．

This chapter is so difficult to ______ that I shall have to read it again later.

You can’t dial 110 ____ you are in an emergency and in need of help.

This is an age so many foreigners are crazy about teachings of Confucius.

Did you get wet when you were on vacation last weekend—No, I didn’t. Because I took umbrella with me.