Please remainuntil the plane has come to a complete stop.
| A． | to seat | B． | to be seated | C． | seating | D． | seated |
Some people care much about their appearance and always ask if they look fine in ________ they are
wearing.
| A．that | B．what | C．how | D．which |
Among the crises that face humansthe lack of natural resources.
| A． | is | B． | are | C． | is there | D． | are there |
An ecosystem consists of the living and nonliving things in an area ________ interact with one another.
| A．that | B．where | C．who | D．what |
at the photos, illustrations, title and headings and you can guess what the reading is about.
| A． | To look | B． | Looking | C． | Having looked | D． | Look |
I cannot hear the professor clearly as there is too much noise ________ I am sitting.
| A．before | B．until | C．unless | D．where |