I think it will be difficult ______ a robot _____ the same things as a person.
| A．as; to do | B．for; to do |
| C．for; doing | D．as; doing |
— _________ have you lived there?
— Since I came here in 2001.
A. How long B. How often C. How soon
Trees can stop the wind ______the earth away.
A. from blowing B. to blow C. blew
______Mum was ill yesterday, _______ she still went on working.
A. Though; / B. Though; but C. Because; /
I am glad to hear that you_________________ in English..
A.have made a rapid progress
B. have make rapid progress
C. have made rapid progress
Students ought _________ the truth.
A. to tell B. tell C. telling