Please do me a favor—________ my friend Mr.Smith to Youth Theater at 7:30 tonight.
______ the forest park is far away, a lot of tourists visit it every year.
There are still many problems ______ before we are ready for a long stay on the Moon.
______ I have a word with you? It won't take long.
I borrowed the book Sherlock Holmes from the library last week, ______ my classmates recommended to me.
Last night, there were millions of people ______ the opening ceremony live on TV.