Ugly papers sold on streets are another problem of pollution.Young readers should _______ them.

“You’ll have to wait for two hours, ________ is, at about 11:30, ________ the medical report will come out.” the doctor said to me.[ ]

We need to do some research to the answer．

mom that not everyone could manageto have 3 meals on time everyday, _____

If you plant watermelon seeds in the spring, you _____fresh watermelon in the fall. [ ]