.. After going into the concert hall, the mother _________ a friend and went over togreet him.
She didn’t ______ work when she had the baby.
______ the students in our class is 50 and _______ them study very hard.
She searched all the places where she _____ have left her necklace but it was all in vain.
---- Why don’t you try to do exercise to lose weight? ---- I have tried everything but it has made no _____________.
Some problems ___ in the lecture by Mr.Smith are very popular in our school, such as the waste of electricity, water and food, etc...