—Tim, you are leaving for the Yellow Stone Park tomorrow. Why not pack your clothes and food up now?— .A Help yourself B.. Good ideaC. Go ahead, please D. Me, too
I am concerned __________ it that I can't concentrate __________ my work because of headache.
His daughter couldn't concentrate __________ her studies with all that noise going on.
Mr. Bill Clinton was elected __________ President of the United States in __________ 1990s.
At __________ present we are going through a hard time, but I'm sure __________ things will get better in the near future.
The cakes are delicious. He would like to have __________ third one because __________ second one is rather too small.