—What can we do to help others?—We can ______ a food bank to help hungry people.
向一定质量的AgNO3和Cu(NO3)2的混合溶液中加入WgZn,充分反应后过滤,将滤渣洗涤、干燥后在称量,得到的质量为Wg.据此,下列说法不正确的是( )
I woke up with______ bad headache, yet by______ evening the pain had gone.