If you are weak _____ a subject, ______ and asking a teacher for advice can help.
Look ! There are a number of________on the farm.
--Now most teenagers write to each other not by letter ________online. --Yes, the Internet has become a part of their life.
--This pair of shoes looks very pretty. --Really! Why not ________?
--Attention please, everybody! Please ________. Mr Green will begin his report at once.
-- Is this i-phone _________? --No, it isn’t. I am just thinking of buying________.