Ladies and gentleman, please fasten your safety belts. The plane________. [ ]

Mary is looking forward to _______ from me, please remember _____ this letter on your way to school.

Remember this ,children ,carefulyou are , mistakes you will make .We know ,Miss Gao .

80. Poets often _________ spring to hope; autumn to harvest .

The argument remains extremely heated ______ there are necessary conditions of existence such as water on the Mars .[ ]