To their delight, their newly-developed products were not _____ for the demand as soon as they went on the market.
| A．qualified | B．flexible | C．available | D．adequate |
The frozen waterfall has attracted floods of tourists to ____ the natural beauty.
| A．cherish | B．admire | C．observe | D．discover |
Although he has become wealthy, Mr. Wood remains _______ he used to be, modest and friendly.
| A．that | B．how | C．who | D．what |
Modern plastics can _________ very high and very low temperatures.
| A．stand | B．keep | C．hold | D．remain |
---What does PM2.5 mean?
--- It’s a professional ______ indicating the condition of air pollution.
| A．number | B．mark | C．term | D．item |
--- How are things going, Janet?
--- They have set out to deal with the present situation ______ they think deserves their immediate attention.
| A．which | B．where | C．when | D．what |