re reserve for white－flag dolphins was set up in 1992, ________ boats have beenprohibited from sailing around since then.

Is Jack back—— No, but I think he ______ in half an hour.

tree, _______ branches are almost bare, is very old.

Although it is ________ to watch programs on TV sometimes, I think people shouldn’t spend all the time watching it.

The doctor ________ the woman ,but he couldn’tfind out what was wrong with her.[来