_________to see us, the professor gave us a warmwelcome

It’s such difficult work, but _____ of them four felt frustrated.

I kept ______ the incident, asking myself again and again how it could have happened.

I must be off now, but I hope we can _____ each other _____ letter[ ]

Many young people don’t work hard, and regret it later when the opportunity is gone.They only realize it________it is too late