Father Christmas is an old man ______red clothes. （  ）

A．to

B．in

C．on

We should know the secret  good health. （   ）

A．to

B．on

C．at

It’s time ____ dinner. （）

A．to

B．for

C．for have

根据句意，用画线单词的反义词补全句子。
1. —Don’t be late.
—OK, I will be ________.
2. Please don’t come after 4: 00 in the afternoon. Please come ________4: 00.
3. Skating is easy for you, but it is ________for me.
4. You can jump ________. I can jump low.
5. The desk is ________. The chair is light.

Please open the present _____me.

A．for

B．at

C．to