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.