f modern agriculture, more and morewaste is produced.

“________Libya’s oil production returns to normal, I guess, it will be fifteen months, ” said a UN expert. [ ]

When they heard the bad news, they all looked＿＿＿＿at the master and felt quite＿＿＿＿＿.

It is said ______ vegetables and fruits are good to our health, apples and pears _________

We must__________ a topic before we start to write.[ ]