She seemed to be very tired, but if she could ______ for more than 5 minutes, she could break the record in the long-distance race.

I waved to Nancy, but she was ______ in her thoughts, and made no response.

are three girls in the room, ________is Tom’s sister.

I think you’ll find the trip_________![ ]

If you help us solve the problems, you may go to America for a free trip. — It’s a very nice ________, but I really can’t accept it.