－Jeffery seems to go without proper food and sleep for days.－Leave him alone.That’s________he reacts to a lost love

It’s more than half a century _____ mygrandfather joined the Party and became a servant to the people

Henry will give us a report as soon as he_______.

cientist spent years alone in the forest, ______ by eating wild fruit and small animals.

It’s said that scientists have ________ a way todeal with the disease(疾病)—Really That’s great!