Make sure that good behaviour is rewarded.

　　確保良好的行為受到嘉獎(jiǎng)。

　　Make sure that you drink plenty of fluids.

　　一定要飲用大量流質(zhì)。

　　Make sure the letter is properly addressed.

　　一定要正確書(shū)寫(xiě)信上的地址。