The number of foreign students attending Chinese universities ______ rising steadily since 2009.
| A．is | B．are | C．has been | D．have been |
Helen ________ her keys in the office so she had to wait until her husband ______ home.
| A．has left; comes | B．left; had come | C．had left; came | D．had left; would come |
People in Tianjin are proud of ______ they have achieved in the past few years.
| A．that | B．which | C．what | D．How |
Bears often hide themselves in places __________ can’t be found by hunters.
| A．in which | B．where | C．that | D．不填 |
There were dirty marks on her trousers _______ she had wiped her hands.
| A．when | B．which | C．where | D．That |
After a lot of questioning, Jack ______ admitted he had taken the car.
| A．frequently | B．eventually | C．absolutely | D．Generously |