Some people’s _______ is more efficient than others.
（A）metabolism
（B）microbes
（C）barriers
（D）bacteria
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- 1He was putting a saddle on the _______.
- 2The _______ of the house is beautifully painted.
- 3A piece of rock had fallen and ( ) up the path.( block)
- 4Human beings also belong to the _______ species.
- 5The lion ______ the deer.
- 6-Why didn’t you come? - ( ) my father wouldn’t let me.(before/even if/because三选一)
