You can only be sure of __________ you have at present; you cannot be sure of something __________ you might get in the future.
His mother had thought it would be good for him to ________from home and earn some money on his own.
If you’re________ about Australian cities,just read the book written by Dr.Johnson.
It is reported that more and more people die of illness________taking drugs.
One of the requirements for a fire is that the material ________to its burning temperature.
An experienced doctor usually judges a patient’s illness according to the various________.