根据句子意思，用括号中所给单词的适当形式填空，并将答案填写在答题卡标号为51-56的相应位置上。
小题1:My daughter is old enough to look after (she). She can stay at home alone.
小题2:We need to realize the (important) of making full use of our time.
小题3:It’s so (fair)! Mary has got more money for less work!
小题4:The students are looking forward to (have) a holiday. They are just too busy these days.
小题5:— Jimmy will hold a party for his (twelve) birthday. Let’s buy a present for him.
— OK. Let’s go.
小题6:It rained so (heavy) last night that many streets were in water.
