I want to buy a present _________ my mother.[ ]

Do you like your maths teacher? —Sure, because he is the teacher ___ helps me a lot.

You didn’t come to the meeting yesterday afternoon, did you? —No, I ________ at the station for my uncle from Beijing.

What do you have ________ lunch?[ ]

He is such a busy man that it’s hard for him to________ enough time to meet us at the airport.