Вставьте Модальные глаголы could,can,be able to,must,have to
 1) it was so heavy , that i _ not lift it.
 2) he _ not climb up to the top.
 3) we _ get up early if we want to catch the train.
 4) he is very rude. he _ apologize.
							
                                                        
                                                    1. could
2. can
3. must
4. has to
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