---Why you are so worried? --- I ___for my little son all the afternoon, I don’t know why he hasn’t come back so late.
The CDs are on sale! Buy one and you get completely free.
–I am so sorry to have come late for the meeting. -It’s not your fault. With rush-hour traffic and heavy rain, it is no wonder you were late.
I ______ sooner but I didn’t know that they were waiting for me.
---I need to advertise for a roommate for next term.
---? Mary is interested.
Modern science has given clear evidence ______ smoking can lead to many diseases.