He worked so hard that________he made himself ill[ ]

4．My hands are dirtyI ______ the wall the whole morning but haven’t finished yet

Your house is always so neat—how do you ______ it withthree children

________ its high pace, city life still attracts more and more people to move into the city[ ]

Did you visit the zoo? — No, we_______have visited it, but we spent too much time shopping.