Joe ________ his anger, remembering the mistakes he had made before．
| A．held back | B．held up | C．held on | D．held down |
--- Bob, you are absent-minded!
--- Oh, I’m sorry I _______ attention to you, Miss Shute.
| A．haven’t paid | B．wasn’t paying |
| C．am not paying | D．couldn’t have paid |
There was a teapot shaped like a duck, out of _______ open mouth the tea was supposed to come.
| A．which | B．its | C．that | D．whose |
--- Mrs. Smith, please teach me how to draw on the computer today.
--- Oh, no._______. You have to get familiar with the keyboard first.
| A．It is never too old to learn | B．Think twice before you do |
| C．Learn to walk before you run | D．One today is worth two tomorrows |
He told us that the girl was _______, so we went to save her.
| A．dangerous | B．in danger | C．a danger | D．endangering |
Vitamin D helps our bodies make a special chemical, and this special chemical, _______, affects our brains, making us feel happy.
| A．in turn | B．in particular | C．in return | D．in short |