To understand the grammar of the sentence you must break it___ into parts.

Although there is a difference in spelling,pronunciation between American English and British English,both of the countries have much to________

— What Jack wore that day was very strange.— Yes. I didn't     him until he called my name.

As this is a very casual get-together, you can tell them to ______ however they feel like to.

In order to ______ his muscle, Mike goes to the gym regularly to do exercise.