Ответ:

4.

1) who;

2) which/that;

3) who;

4) which/that;

5) which/that.

(Странно, что ни разу в тексте не используется where, хотя в задании оно указано).

5.

1. My teacher may be ill.

2. I might win the competition.

3. The dog might want some food.

4. The library may close at 5 p.m.

5. My friend might feel embarrassed about our argument.

Объяснение:

Ответ:

№4

1. who

2. which

3. who

4. which

5. which

№5

1. My teacher may have an illness.

2. I might win the competition.

3. The dog might wants some food

4. The library may closes at 5 p.m.

5. My friend might feels embarrassed about our argument.