----When can we go to visit you?
---- Anytime you feel like ______.
| A．one | B．it | C．that | D．so |
____ to teaching, as we know, contributes to his popularity with his students.
| A．To devote | B．Devoted | C．Being devoted | D．Devoting |
It does not matter that you are a slow walker _____ you never walk backwards.
| A．as long as | B．as soon as | C．unless | D．until |
President Xi appeared in Zhongshan suit in Dutch, ____ displayed the leader's national pride and confidence
| A．as | B．where | C．that | D．which |
Since the sales promotion, all the items _______well.
| A．have been sold | B．were sold | C．had sold | D．have been selling |
The waste water, when _______，should be clean enough to meet standards.
| A．releasing | B．being released | C．released | D．to be released |