(2013·安徽，27)This project requires close teamwork.________ will be achieved unless we work well together.

(2013·天津，2)If you are in trouble，Mike is always willing to________a hand.

Don’t touch your eyes, nose and mouth, because they aren’t covered by skin and can ________ the virus easily.

Joe Jones, the eldest of the eight children, had to ________ out of high school at the age of 16 to help his father on the farm.

It’s ______ that the boy break away from the bad habit of sleeping at class.