Ответ:

Номер 1

1.misterious

2.puzzling

3.unexplained

4.extraterrestrial

5. Secret

Номер 2

1. To

2. Faster

3. For

4. Step

5. Saying

Номер 3

1. went missing

2. Went missing

3. To go through

4. Is going for me

5. To go one step further

Номер 4

1. Can't

2. Must

3. Could

4. Can't

5. Must

Номер 5

1. Can't

2. Might

3. Can't

4. Must

5. Can't