Misunderstandings________from lack of social communication，unless________properly，may lead to serious problems.

acertain doubt among the people as to the practical value of the project

26．—Can you attend the party tomorrow，Tom? —I can when my headaehe_________completely

Do you know if Linda is willing to take charge of the program —-_______, does it

o cause us some health problems, in fact, farmore serious ________ than mobile phones do