The colors on the national flags can be ______ differently in different culture, but they have one thing in common, that is, ______of the colours was carefully chosen.

Those who ____ in ____compositions, please hand them in this afternoon.[ ]

How I wish I him now.

is mother was ill yesterday, so hehad to _____ a doctor.

Students _________ to use theirdictionaries when they _________ an English test.