主要内容：

keep your head above water I’m not sure how much longer we’ll be able to keep our heads above water.

throw in the towel We're not going to throw in the towel just because we lost one game.

keep your eye on the ball To do well in this office, you'll have to keep your eye on the ball.

neck and neck The two rivals are neck and neck in the polls.

A ballpark figure I can give you a ballpark figure.

bowl over I went to see his latest exhibition, it really bowled me over.

be a front runner He is one of the front runners in the presidential election.

To give it your best shot Whether you pass or fail in the test at least you know you gave it your best shot.

To (make a) pitch for something He pitched the idea at us, but we turned him down.

To play it safe You'll never be truly successful if you always play it safe.