Telescopes are （有用的）．We can look at the universe through them．
﹣Could you pass me those （盒子）？
﹣Certainly．Here you are．
Last year Susan gave a /'flauə/to Ms．Lu on Teachers'Day．
The new hotel will be built /bi'said/the river．
We must try our （our/ours） best to protect plants．They're important to human beings．