---You may find the key to the maths problem on page 107. ---Ah, it’s so simple. I wonder why I ________ of that.
I like getting up very early in summer. The morning air is so good ______.
He came to my class every week, but his attitude ______ he was not really interested in the subject.
To tell ______ truth, he is at ______ loss what to do currently.
--Alice, turn off the light and lock the door before you leave. -- ______.
---How are you getting on with your classmates? ---______. I’ve got to know them all.