I didn’t quite follow him because he explained the theory _____that is too abstract for me.
I have to see the doctor because I __________ a lot lately.
When you are home, give a call to let me know you __________ safely.
Tom __________ in the library every night over the last three months.
—I remember you were a talented pianist at college. Can you play the piano for me?—Sorry, I __________ the piano for years.
In order to find the missing child, villagers __________ all they can over the past five hours.