用下列方框中所给动词(组)的适当形式填空: (每小题1分，共7分) 
小题1:Meat should ____________________ to make dumplings.
小题2:The man ___________ president of USA is named Barack Obama.
小题3:_____________ the chance, and you will get out of the difficult situation.
小题4:___________ to 2016, we are full of confidence, and believe that the future of the company will be brighter with our joining.
小题5:The difference in thickness and weight from the earlier version makes the iPad2 more comfortable ___________.
小题6:We’d better have the road signs __________________ clearly so that the tourists know in which direction to go.
小题7:The workers shall protect the underground and underwater cables when _________ construction.
