1. We tried ___ the problem, but it seemed too difficult ___
a) to be solving, to have solved
b) to solve, to solve
c) solving, being solved
d) being solved, to be solved
2. Tom looks forward to ____ his colleagues after his long journey.
a) see b) be seen c) seeing d) having seen
3. The teacher remembered ___ the picture by someone many years ago.
a) having shown b) having been shown
c) showing d) shown
4. The child ___ ___ care of by his parents and grandparents.
a) is sure, to be taken
b) believed, to take
c) expected, take
d) is certain, to have taken
5. The director ___ mind ____ the project to our foreign sponsors.
a) don't, to show
b) hasn't, shown
c) didn't, being shown
d) doesn't, showing