If only I _____ play the guitar as well as you!

_________, the most controversial candidate in the election campaign, he has been strongly criticized for his crude comments about women.

Thebackgardenofourhousecontainsalawn，____verypleasanttositoninsummer.

Ifnot_____withtherespecthefeelsduetohim,Jackgetsveryill-temperedandgrumblesallthetime.

ProfessorJohnsonissaid_____somesignificantadvanceinhisresearchinthepastyears.