Dad, I can’t open my e-dictionary in my computer.—You can _____ the computer and try again.

There are some birds singing ___ the trees.[ ]

Excuse me, have you seen ________ lovely cat?—Is it ________ black cat? Just now I saw it sleeping under the table.

As their memories decline,some old people tend to be talkative because they______ forget what has just been said.

______ is he?—He’s fifteen. [ ]