Помогите пожалуйста! 
1. When we went to the forest, we____ smell burning
a) could
b) can
c) must
d) might
2. If I ___ any help I___  my friend
a) need, 'll phone
b) 'll need, 'll phone
c) 'll need, phone
d) needed, 'll phone
3. She spoke in a very low vioce, but I ____ understand what she said.
a) could
b) can
c) must
d) might
4. She is a very nice person. You____ meet her.
a) can
b) are able
c) must
d) have
Спасибо огромное!