Ⅰ. 完成句子: 用所给动词的适当形式填空
1. If I (go) to the party, they (be) glad.
2. If you (feel) sick, (call) a doctor.
3. If it (rain) next Sunday, we (be) able to plant trees.
4. If the sun (come) out, the temperature (rise).
5. You (get) purple if you (mix) red and blue.

1. go; will be
2. feel; call
3. rains; won't be
4. comes; rises
5. get; mix

1. 此句为if引导的条件状语从句，遵循“主将从现”原则，从句用一般现在时go，主句用一般将来时will be。
2. 前半句为if引导的条件状语从句，用一般现在时feel；后半句为祈使句，用动词原形call。
3. 从句用一般现在时rain，主句根据语境“不能种树”，用一般将来时的否定won't be。
4. 自然现象用一般现在时表将来，从句用comes，主句用rises。
5. 客观事实用一般现在时，主句用get，从句用mix。

Ⅱ. 完成句子: 用括号中所给单词的适当形式填空
1. If you're free this weekend, (drop) me a line.
2. Many students meet (difficulty) when they learn new language, especially with pronunciation.
3. You should take your studies (serious) if you want to get into a good high school.
4. Problems often disappear after face-to-face (meeting) because body language helps a lot.
5. After six months of (train), Ben was able to bring him home.

1. drop
2. difficulties
3. seriously
4. meetings
5. training

1. 句子为祈使句，使用动词原形，故填drop。
2. 句意为遇到困难，一般困难不止一个，故填difficulties。
3. 固定搭配take...seriously，意为“认真对待”，故填seriously。
4. 句意为面对面会谈，meeting为可数名词，此处用复数形式，故填meetings。
5. 介词of后接名词，train的名词形式为training，故填training。