Your help has made a big difference－I understand the work better now．

The kilogram is the international standard of weight．

He speaks standard English．

He criticised my taking risks．

Would you like to read and criticise my new book?

The combination of the 50 states forms the United States of America．

Misfortune doesn’t always comes in combination with failure．

He made an attempt on the world record．

The prisoners’ attempt to escape failed．

He had to present a smiling face though heavy-hearted．

May I present a suggestion?