Where did you meet him for the first time? — Maybe it is in the museum we listened to the lecture we got to know each other.

They will call us as soon as they ______ there.

A lot of trees________ around here every year, and we can enjoy fresher air now.

I _________ my mum cook dinner in the kitchen when the telephone ______.

Lingling’s aunt will meet her________the airport________Saturday morning.[ ]