23. There were reports that three companies were ______ to market drug.
| A．advocating | B．previewing | C．negotiating | D．Reserving |
--- 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 |
Do you know what use people _______ pines after they’re cut down?
| A．make of | B．make into | C．make up of | D．make from |
My parents will move back into town in a year _______.
| A．later | B．after | C．or so | D．about |