16. Having a trip abroad is certainly good for the old couple, but it remains ___ whether they will enjoy it.
A. to see B. to be seen C. seeing D. seen
17. He is a man of great experience, ________ much can be learned.
A. who B. that C. from which D. from whom
18. The employee you had been thinking highly_______ dishonest.
A. of proving B. of proved C. of to prove D. of being proved.
