1.Insert a correct artile (a/an/the) if neccessary to complete the following sentences. 1.Would you like................ham and cheese sandwich? 2.There is..............stilt house in my grandparents village. 3.The communal house is used as........place of worship. 4.You have to protect yourself with ................strong username and password. 5.In ...............afternoon,my brother and I feed.................chickens and collect their eggs. 6.................Kinh people have..................largest population among 54 ethnic groups in Vietnam. 7.I usually stay at...................home on Satudays. 8.-It's unlucky to light three cigarttes with one match. -That 's only....................superstition.Only ...............idiot believes in superstitions. 9.Passengers must turn off their phones during takeoff so that they don't interfere with ........airplane's communication. 10.Don't choose your date of birth or your phone number as your....................password because it's easy to guess. 2.Fill each blank with a,an or the to complete the following passage. Vietnam is (1).............multi-nationality country with 54 ethnic groups.The Viet people account for 87% of (2)....................country's population and mainly inhabit (3)...................Red River Delta, (4)..............central coastal delta, (5)...............Mekong Delta and major cities. (6).............other 53 ethnic minority groups,totaling over 8 million people,are scatterted over mountain areas spreading from the north to the south. (7)............number of ethnic minorities had mastered some farming techniques.They grew rice plants in swamped paddy fields and carried out irrigation.Others went hunting,fishing,collecting and lived (8)...............semi-nomadic life.Each groud has its own culture and special. However, (9).............evident gap in the material and moral life has indeed still existed between peoples living in the deltas and those living in mountainous areas as well as among ethnic minorities themselves. (10)............Vietnamese government has worked out specific policies and special treatments in order to help mountainous areas catching up with lowland people,and made great efforts to develop and preserve traditional cultural identities of each ethnic minority group. 3.Write meaningful sentences about the appearance of aliens based on the words or phrases given,using ''may/might''. 1.Aliens/a hard container/brain. 2.They/two eyes/a nose/a mouth/us. 3.Besides teeth/aliens/other systems/eating. 4.They/not have necks/because/they/turn/round/their heads. 5.They/two arms/but/arms/suckers/pick up small objects. 6.Their hand/only three or four fingers.