Yesterday, when I went past the classroom, I _______ someone _______.

The summer vacation is coming．Do you have any ideas about the coming vacation?－I volunteering in the old people’s home．What do you think of it?

Where is your mother?— She has ______ to Sichuan on business. She has ______ there four times recently.

Jim and I will go to the post office this afternoon.—________. ________ go together ?

______are good friends.