His parents,       , didn’t look after him very well—the elbows of his jacket and his boots were badly worn out.

—What time do we have to be at the gate of the museum?  —______ the visitors begin to check in.

We didn’t know you were in trouble at that time,_____ we would have given you a hand.

After two years' research，we now have a ________ better understanding of the disease.(2013·全国Ⅱ)

In my opinion , the thief is likely to come , please look _____ for him .