_______, when Marx was already _______, he found it was important to study the situation in Russia, so he began to learn Russian.
.—I have a sore neck. -- You should see a doctor. --- ______________.
I walked along the seaside and saw many people _________ on the beach.
—-Lisa has a sore back ? —I think she____ go to a doctor.
The little baby has two new ______?
– My head feels very hot. —Maybe you have a fever. You should _______ your temperature.