He explained again and again in order to make what he did .( )
A.understandB.understood
C.to understandD.understanding
Betty felt so tired last night that she ____fell asleep in bed after lying down.( )
A.recentlyB.suddenly
C.frequentlyD.immediately
Sam finds sweeping robots useful,and he plans to buy _____for his grandma.( )
A.itB.oneC.thisD.that
The living room becomes ____as the sunlight comes in through the windows.( )
A.biggerB.cleanerC.quieterD.brighter
Sir,did you enjoy your stay in our____?
Yes,I slept well and I like the breakfast.( )
A.hotelB.schoolC.factoryD.company
Peter,shall we go for a picnic this Sunday?
OK.Let's add it to ____weekend plan.( )
A.aB.anC.theD./