Can you go to row a boat with us this afternoon? – I’m afraid not. I_______ look after my little sister because my mother is out.

What do you want to do for vacation?—I ____ my aunt.

_________ you can greatly improve your spoken English in a short time.[ ]

I knocked into a tree when I went to the bus stop for my friend.—I suppose you _____too fast.

Thanks ____ your last letter.[ ]