Can ’ t you __________ your visit for a few days? 2. We have taken effective measures to __________ our natural resources . 3. It ’ s still under __________ , so the manufacturer will repair it. 4. My __________in life is to help poor people. 5. She pressed her skirt to try to remove all the __________. 6. You need to be tough to __________in the jungle. 7. The __________ of wheat have increased this year despite the bad weather. 8. The president __________ that a new currency would be issued. 9. It is __________ that you arrive on time. 10. She __________ her clothes in the wardrobe. 请从以下的词汇中选择恰当的词汇填空 preserve; mission; survive; wrinkles; essential; stuffed; proclaimed; extend; yields; guarantee;