There ______ little water in the river.

--- Must I hand in my report now? --- No, you ________. You still have some time.

 ----_______I come back before 11:00?----No, you________. But you  ________be back later than lunch-time.

(2013·高考新课标全国卷Ⅱ)Since nobody gave him any help，he________have done the research on his own.

He has poor _______, so he can’t see the words on the blackboard clearly.