With hundreds of attractions, Beijing is a city _____ makes a lasting impression on itsvisitors.
| A．which | B．where | C．what | D．when |
_________ that he had fallen behind, he tried to work harder.
| A．Realize | B．Realized | C．To realize | D．Having realized |
The White family _____very large. All the family ______ animal lovers.
| A．is; are | B．is; is | C．are; is | D．are; are |
The population of our country at present is ______ that 30 years ago.
| A．as twice large as | B．twice as large as | C．twice as many as | D．as twice much as |
Turn on the TV or open a magazine ______ you will often see advertisements showing happy, balanced families.
| A．but | B．till | C．and | D．or |
—Do you mind my smoking here?
—______. This is a non-smoking room here.
| A．Yes, please | B．Yes. Better not. | C．No, thanks | D．No. Good idea |