Among the crises that face humansthe lack of natural resources.
| A． | is | B． | are | C． | is there | D． | are there |
Prices of houses_______sharply in the past decade.
| A．rise | B．are rising | C．have risen | D．rose |
Who do you think will take_____office next month and become____president of the country?
| A．the; a | B．a; 不填 | C．the; the | D．不填；不填 |
－Mom, I’m so tired. I can’t walk any further.
－_______, my dear. You can make it.
| A．Come on | B．No worry | C．That’s impossible | D．No problem |
---- Have you been here before?
---- This is the second time I ______to the Great Wall.
| A．comes | B．have been | C．came | D．had come |
Julia _____ with a stranger when Jim went to the jacket he _____ in the restaurant．
| A．had quarreled; left | B．had quarreled; had left |
| C．was quarreling; has left | D．was quarreling; had left |