My friend is ______her sister.
If you are weak _____ a subject, ______ and asking a teacher for advice can help.
--Would you like some tea?--Yes, please. By the way, do you have any milk? I prefer tea_______ milk.
--Do you know the man with a pair of sunglasses is?--An actor, I think.
My hair needs ________ , I have to have it ________.
Ted together with his friends had a good time when hiking, ?