She got so angry that she ran after them.She was soon________，but she continued to run

Sinking in the cheers of people, David walked off the stage, tears droppinghe could stop them

The research on the new flu virus vaccine is challenging and demanding. Who do you think can do the job?—____ my students have a try?

e trouble, you may as well _______ the product online before you place an order.

May I ask a question after class, Sir—______, but not during my lunch break.