Computers were ________（发明）not long ago, but they are popular now.
Sally is my best friend．We often help with schoolwork．（相互）
Many children use Internet to get useful information and to relax in their ．（空闲时间）
Kevin's birthday is coming．His parents are planning to make for him．（一顿大餐）
It is said that if the birthday person blows out all the candles in one go，the wish will come true．
It's very convenient to buy different kinds of bottled drinks in the supermarket．