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(hope ) as she handed out the sweets. 4. The river has been ______ (pollution) by waste water from the factory. 5. There are ______ (crowded) of people in the shop every day. 6. The special boots can prevent us from ______ (float) in the air. 7. By next year, we ______ (learn) 2,000 English words. 8. This maths problem is too difficult for me ______ (work) out. 9. By the end of yesterday, he ______ (write) to him five times. 10. Can you imagine ______ (live) on the other pla in the future? 四、完成下列句子: 1. 空氣罐可以為航天員提供數(shù)小時(shí)的空氣。 ____________ _____________________________________________________. 2. 你認(rèn)為什么是最不重要的? ____________________________________________________________ _____. 3. 你能幫助我學(xué)習(xí)英語(yǔ)嗎? _________________________________________________________________? 4. 每個(gè)學(xué)生家里將會(huì)有一臺(tái)電腦并與星際之間的電腦網(wǎng)絡(luò)連接。