Choose the best answer.

Most parents are willing to lend their ear to their children.

It is Mary who made a great contribution to her husband's success.

It was Mary who makes a great contribution to her husband's success.

It was Mary who make a great contribution for her husband's success.

It was Mary who made a great contribution to her husband's success.

It is at the age of 20 that he gains impressive achievements.

It was at the age of 20 that he gains impressive achievements.

It is at the age of 20 that he gained impressive achievements.

It was at the age of 20 that he gained impressive achievements.

It is great enthusiasm that candidates all over the world took part in the competition.        

It was great enthusiasm that candidates all over the world took part in the competition.

It was with great enthusiasm that candidates all over the world took part in the competition.        

It is with great enthusiasm which candidates all over the world take part the competition.

It is in Da Lat that he spent his summer vacation.     

It was in Da Lat that he spent his summer vacation.

It is in Da Lat that he spends his summer vacation.

It was in Da Lat where he spends his summer vacation.

It is until the age of 15 that

It is not until the age of 15 that

It is the age of 15 that

It is until the age of 15 who

It is his girlfriend

It was his girlfriend's handbag

It is his girlfriend's handbag

It is his handbag