I saw you came to school by taxi this morning.–Oh, I_______ come to school by taxi, but it is raining today.

If you have a holiday, why not ________ on atrip

There are nine books in the library.

填入下面文段空白处的词语，最恰当的一组是真正的在自然状态下的野生虎都是独居， ① 在交配期雄虎和雌虎 ② 在一起生活。野生动物园 ③ 保证观赏性，把一大群老虎圈养在同一片区域， ④ 说这个区域看起来很大、很宽敞，跟野外环境里一只老虎正常的巡游范围还是 ⑤ 没法比， ⑥ 这种圈养方式本身还是在违背动物的天性。

However, at times this balance in nature is disturbed, _______ a number of possibly unforeseen effects.