Scientists ______ thousands of chemicals before they decided on the right one in the end.
| A．tried out | B．found out |
| C．worked out | D．turned out |
Unfortunately，the band ______ of a singer, two guitarists and a drummer broke up soon.
| A．consists | B．consisted | C．is consisted | D．consisting |
The factory used 65 percent of the raw materials, the rest of which _____ saved for other purposes.
| A．is | B．were | C．was | D．are |
—Your brother was brave enough to tell the truth in public.
---Yes, and he will never regret_________ that. I admire him so much.
| A．to do | B．to be doing | C．to have done | D．having done |
Could I have a(n) ______ word with you, Mr. Thomas? It won’t take up too much of your time.
| A．honest | B．straight | C．simple | D．brief |
_____ of danger in the street at night, she had to go home, with a friend ____ her.
| A．Warning, following | B．Having warned, following |
| C．Having been warned, following | D．Warned, followed |