-What are you busy doing, Sandy?- I’m making some flash cards _________ me remember English words.
--Please don’t forget to turn off the lights again,Tom. ---____________.
---Excuse me!How long may I ________this book? ---For about a week.
Do you mind ________the door for me? __________
A long time __________ since he ________ Shanghai.
My dad __________ Singapore for a meeting. He ________ there twice.