---In recent years, _____ problem of global warming has been very serious.
---That’s right. People are facing ____ number of natural disasters now.
| A. the; a |
B. a; the |
C. a; a |
D. the; the |
_______in charge of the shopping center has upset him for quite some time.
| A．Left | B．Being left | C．Having left | D．To leave |
The computer looks old, but it _________ just half a year ago.
| A．has been bought | B．will be bought | C．is bought | D．was bought |
The art centre is _____ used to be a factory, _____ millions of tractors were made.
| A．what; where | B．where; where | C．what; which | D．where; which |
The coach asked his staff to_____the large group of journalists waiting for him to announce his training plans.
| A．adapt to | B．attend to | C．refer to | D．appeal to |
With the price of ______ petrol rising, the bicycle may become ______ popular means of transportation again.
| A．the; a | B．the; the | C．/; a | D．/; the |