单选题 Mother told me that she would come back ______

单选题10.Ifonlyyou______himwhatIsaid!Everythingwouldhavebeenallright.

单选题49.Ournewteacherisnotexperiencedandcan'tmakehimselfclearly______inclass.

单选题13.Shekeepsasupplyofcandlesinthehouseincaseofpower______.

单选题29.Shetriesherbestto______thechangesinfashion.

单选题23.Idon'tthinkyoucanfinishpaintingthefencealoneinsuchashorttime,______?

单选题23.Atleast150peoplearebelieved______intheaircrash.

单选题17.Theeveningnewscomesonat7o'clockand______forthirtyminutes.

单选题41.Ifonlyyou______himwhatIsaid!Everythingwouldhavebeenallright.

单选题.Averyinterestingandimportantdevelopmentinscienceisadevicecalledlaser.Alaserisamachinewhichproducesalightbeam.Thelightproducedbyalaserisaveryspecialkindoflight.Thelight,calledalaserbeam,ispowerfulandcanbemadetodomanythings.Thelaserwasfirstdevelopedin1960,aboutmorethanhalfacenturyago.Therearemanydifferentusesforlasersandseveraldifferenttypeshavebeendeveloped.Someusegasestoproducethelightbeam.Thegasesareheatedandcooled,andtheseprocessescausethegasestoproduceenergyintheformoflight.Onespecialpointoflasersisthatthelightbeamcanbestored.Ifthestoredlightisthensuddenlyletgo,itisextremelypowerful.Thelightfromalaserbeamcanbeusedeitherbystoringitandlettingitgosuddenly,orbyusingitinacontinuousstream.Therearethreeimportantareaswherethecontrolofthelaserbeamhasbeenputintousebyscientists.Theseareasareindustry,communications,andmedicine.Ineacharea,thescientistshavebeenabletousethelasertodothingsthattheycouldnotdoinanotherway.Thelaserhasbeenveryhelpful.Inindustry,thelaserbeamhasbeenusedformeasurementanddrilling.Whensomethinglargeisbeingbuilt—forexample,alargebridge—itisimportanttohaveveryaccuratemeasurements.Byaccuratemeasurement,lasersarealsohelpfulinlayingdownpipelinesoverlongdistances.Aslasersbecomemorecommoninindustry,therewillbemoreandmoreusesforthem.

单选题27.Evidencecameup______specificspeechsoundsarerecognizedbybabiesasyoungas6monthsold.

单选题42.Undernocircumstances______theparty.

单选题 To a great ______

单选题33.Onemustobtain______fromthelandownertohurtinthisforest.

单选题 We lost our way in that small village

单选题 My mobile phone isn't in my bag

单选题 The new school building

单选题7.Theroadtotheislandonlyappearswhenthetidehas______.

单选题5.Whatwewouldlikeyoutoknowisthatwegreatly______yourtimelyhelp.

单选题13.Chinesepeoplespend______moneyontravelingtodayastheydidtenyearsago.