V.Choose the best answer A, B, C or D to complete the sentences. 1.In some areas, when you meet old people, you…………….. take off your hat to greet them and show your respect. A. should B.shouldn't D.have to C.don't have to 2.It's a rule, so everyone………………………….strictly follow it. A.should B.shouldn't C.doesn't have to D.has to 3.Lang Lieu couldn't buy any special food…………………he was very poor. A. although B. when C. while D.because 4………….the other sons were looking for special foods, he was making chung cake and day cake. A.Although B.Even though C.While D.If 5.He was wearing shorts,……………………….he was not allowed to go into the temple. A.and B. but C.or D.so 6.Her mother told her to go straight to her granny's house,………………….she forgot. A.and B.but C.or D.so 7.Tam is a beautiful girl;……………………… , she's kind-hearted. A.therefore B.however C.moreover D.otherwise 8.Lac Long Quan missed his life in the sea;……………….he took 50 sons back there. A.therefore B.however C. moreover D.otherwise 9.While I…………….the pefomance, I met one of my old friends. A.watched B.was watching C.watch D.am watching 10.The girl was crying when a fairy………………. Review unit 4- By Lucky 3 A.appeared B. Reading B.was appearing C.appears D.is appearing