中山市技能鉴定中心:we accept 50% down payment 是什么意思？

we accept 50% down payment 是什么意思？ We can accept the price 1.5USD for 50pcs , but for more than 500pcs we wont back down什么意思？ we been down all our lives receive&accept Sometimes we feel down because we didn't do as well on an exam as we____ No sooner than we reached the top of the hill ___ we all sat down to rest. No sooner than we reached the top of the hill ___ we all sat down to rest. ( )?Yes,we had a P.E. lesson yesterday afternoon. we'd take(p )in the game.