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I ____________(read) your book.(=I’ve finished it.)

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I __________(travel) a lot inAmerica. (= I know America.)

1、如何配制以下溶液,(包括用什么仪器计量;准确至几位;加何种溶剂及数量多少;如何溶解等):(1) 2g/L酚酞的乙醇溶液100mL(2) 1:2三乙醇胺150mL(3) 200g/L的NaOH溶液100mL

I _________(work ) all day (and I’m tired out).

The president ______ (assassinate).(=The president is dead.)