draw；         we；       wise；         forty；        survey

（1）Natural resources on the Earth are limited， so people should use them　　．

（2）Della expects to give her father an unusual gift on his　　 birthday．

（3）Neither May nor I will tell this to others． We promise to keep the secret to　　．

（4）Recently Mr．Wu has carried out several　　 to improve the students' daily habits．

（5）Leo with his cousin goes to the　　 Club at the community center twice a week．