根据句意,在答题卡标有题号的横线上,写出括号内所给单词的适当形式。
1. The plane was able to fly over the endless desert without _____________ (difficult).
2. The wife got even _____________ (mad) when the husband went out angrily.
3. While _____________ (attend) junior high, he was the top student in our class.
4. To our surprise, he turned away with an _____________ (patient) look.
1.difficulty2. madder3. attending 4. impatient