What is the meaning of the word "waterproof" in the fourth paragraph?
A. Covered with water.
B. Full of water.
Cleaned by water.
D. Not allowing water to go through.
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A.whenB.beforeC.afterD.while
A. when
B. before
C. after
D. while
A.problemB.questionC.answerD.time
A. problem
B. question
C. answer
D. time
A.some timeB.sometimeC.sometimesD.some times
A. some time
B. sometime
C. sometimes
D. some times
A.invitedB.madeC.offeredD.asked
A. invited
B. made
C. offered
D. asked