She brought with her three friends, none of I had ever met before.
I have been staying up until midnight since Monday, _____ on my paper. I need to catch up on some sleep this weekend.
The place he suggested ______ hold the meeting is a five-star hotel.
It is said that he is focusing on another book on space exploration. When will it _____?
— What on earth are the police busy with?— They _____into how the plane crash came about.
— Why didn’t you go fishing with your friends yesterday?— Well, fishing is an activity calls for a great deal of patience, _____ I don’t have.