—Do you learn Russian or French?—I learn _____.

—Do you learn Russian or French?—I learn ______.

_____city do you prefer, Shanghai or London?

As mentioned above, C imposes relatively few built - in ways of doing things on the program- mer. Some common tasks, such as manipulating(66),(67), and doing(68)(I/O), are performed by calling on library functions. Other tasks which you might want to do, such as creating or listing directories, or interacting with a mouse, or displaying windows or other(69)elements, or doing color graphics, are not defined by the C language at all. You can do these things from a C program, of course, but you will be calling on services which are peculiar to your programming environment(70), processor, and operating system)and which are not defined by the C standard. Since this course is about portable C programming, it will also be steering clear of facilities not provided in all C environments.

（）, or drum is used for hauling in or letting out the wires or ropes which will fasten the ship to the shore.

Effects which are dutiable or subject to prohibitions or restrictions should be declared in （）.

Who do you like better, your father or mother? Why?

Do you like an apple or a banana?（）

Do you like your hometown? Why or why not?

Which do you think is ______ important, money or health?

Do you want to change this lamp for__________or do you want your money back?

If you do not know the subject, you will not understand what is said or written, even if English is your mother （） what is said or written.