Scientists have invented artificially intelligent computer systems ______ of answering questions posed in natural language.

Hughes, 26, a sports therapist, ____ 53 marathons in 53 days in 53 different UK cities.

I was kept awake for most of the night by the ______ of a mosquito in my ear.

Slums are urban areas that are _______ populated with substandard housing and very poor living conditions.

There wasn't a chair for the headmaster, ______ is a big problem. 

It's cloudy and windy. It _______. (rain) 

The main aim of the campaign is to raise __________ of the issues involved.

Mark the letter A, B, C or D to indicate the underlined part that needs correction

According to the results of a survey which conducted by a USA magazine, there isn't really a generation gap.

The restaurant is very popular with film stars, artists, and the ______.

They are happily married although, of course, they argue _______.

Harry was offered a scholarship to study in Spain and he ______ the opportunity with both hands.

Her latest bestseller ____ last month.

Indicate the underlined part that needs correction

Hoa flew to Paris to visit her grandma, so to see Eiffel Tower.

Viết lại câu: I found this film quite disappointing. (LET)

John used to write home once a week when he was abroad.