Before the first nonstop flight made in 1949,it______necessary for all planes to land for refueling.

Nowadays, cellphones have features such as games ,music and calendars and more new functions___.

. All of the guests ___________ by 9 o’clock , but the host _____________ until 15 minutes later .

Mr. Li is absent today. What do you consider ________ to him?

This kind of glasses manufactured by experienced craftsmen ______ comfortably.