She says ______ a smile.

I don’t think I can work_____ the math problem.—Think hard, and you can come up _____ the answer.

He always did well at school _____ having to do part-time jobs every weekends[ ]

We made plans for a visit but _____ difficulties with the car prevented it.

May I use your pen Mine is broken.— Of course, here are two and you can use ________ ofthem.