The traffic light is red, so I______stop my car.
—I can’t thank you enough for the gift you sent me.—__________.
The government has made many laws ______ the people’s interests.
This problem may lead to more serious ones if _____ unsolved.
What a fast learner he was! He_____ a lot of French when he lived with the native.
—Does John serve in the army?—No, but he________in the army for 8 years.