单词拼写 (共7小题，计分7分)
根据下列句子及所给汉语注释，在句子空缺处写出各单词的正确形式（每空只写一词）
The girl picked up some fallen__________ (树叶)from the ground.
Last night I  _________ (花费)half an hour working out the problem.
We saw a group of ducks swimming _________ (慢慢地)across the lake.
August is the  ___________ (第八个)month of the year.
He says that  __________ (加拿大)is a large country in size.
Her brother is standing ___________ (在……后面)her.
Driving on mountain roads always makes me  ___________ (紧张).