根据汉语意思及句意完成句子。(7分)
You’d better ____________(起草) an outline before you write the composition.
How do you________________(与……联系) your parents?  By telephone.
______________(顺便问一下), where is our monitor? She has gone to the library.
We must drive for ____________(好几个)hours to get to the store.
We must help the people__________(在困难时).
Everyone____________(有义务)protect our environment.
Most families in our country had ______(至少)three or four children.