Only by increasing the number of doctors by 50 percent ________ properly in this hospital. (2013·大纲全国，32)

His first novelgood reviews since it came out last month

I ________ many interesting lectures since I came to this school.

I’ve decided to give up my job, Mum.— ___________ You’d better think twice.

_______,when Marx was already _______,he found it was important to study the situation in Russia, so he began to learn Russian.