The best option is D studied.
This word denotes a measured, even-handed approach to the issue. So, it should be :Current immigration policy must be studied before new proposals can be made.
He sent away Martin’s mother and sister because the story is only for Martin to hear!
' C ' has the misplaced modifier. It makes the sentence sound like the commands take the obedience class.
It should say "The dogs that take the obedience class know several commands.".
Bilingualism is important to the community, in the world but especially to me. Bilingualism is important especially if you were to travel to a foreign country. It also helps you understand other cultures and why they do what they do in their daily lives. When you speak or say a simple sentence to someone who speaks another language, it lets them know that you care and respect them. Bilingualism helps you be closer and closer to the people around you and it lets you understand them better... it is also great to have that knowledge because you never know what might happen, you could move somewhere where people don't speak English or any other language you speak so you will have to learn something new which can be hard but if you already know a few phrases or words, then it will be a little bit easier for you.