according to the instructions，the medicine will work for your headache．

The 18-storeyed building, when _____, will shut out the sun _____ up the rooms in my house.

 At no time does the salesgirl get up late in the morning, for she is always too busy _____ a good rest.

       year after year , tigers are becoming fewer and fewer .

The design __________all the ages and social groups is not easy to make.