Gerund or infinitive – do, to do, doing

He's the best at ____ puzzles.

• to solve

• solve

• solving

He is too upset ____ right now.

• to talk

• talk

• talking

We used ____ by the fire on cold winter nights.

• to sit

• sit

• sitting

We are looking forward to ____ you soon.

• see

• seeing

• seen

They decided ____ to Los Angeles.

• moving

• move

• to move

He refused ____ the fine.

• to pay

• paying

• pay

We were very happy ____ her there.

• finding

• find

• to find

We hope ____ to finish before the end of the month.

• be able

• being able

• to be able

She enjoys ____ time with her family.

• spending

• to spend

• spend

She's going to be upset. I forgot ________ (call) her.