用括号内所给动词的适当形式填空。
The report shows that some animals can _______  (train) to work for people.
Those dried flowers _______  (not sell) as well as the fresh ones.
Where is Jim? I’m afraid he _______ (forget) the visit to the museum.
The passengers were told that the plane _______ (take) off in two hours because of the bad weather.
—It is reported the police searched the whole building yesterday but nothing unusual was found there.
—Really? I _______ (think) the thief had already been caught.
In order to complete the task, all the club members had no choice but _____ (stay) up late.
He failed the math exam again because the bell _______ (ring) before he finished the rest half of the testing-paper.
Many scientists are always trying to devote themselves to _____ (study) in different areas.