We are sure they () this bridge by June next year.
A. complete
B. completed
C. hadcompleted
D. will havecompleted
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Today many companies are engaged () the development of new technology.
A. to
B. in
C. over
D. for
With the help of their professor, these students will learn to program their robot to do () they wantto do.
A. whatever
B. wherever
C. whenever
D. whichever
I wrote a letter congratulating him () his appointment as the director of the department.
A. on
B. in
C. with
D. to
Before the age of the Internet, we used to () our holiday through travel agents.
A. book
B. having booked
C. booking
D. have booked