If a=”4,” b=”5,” what’s the answer to the question “ a + 2ab +1 =?”—.

It won’t be long _____ the island ________ to our motherland.

It is necessary_____ others when they are in trouble.[ ]

There is salt in the kitchen. Would you like to go and get _____, Tom? —OK!

.—____ did you leave the classroom? —____ I saw my daughter sit down and read her book.