Many rules in English are ______, and large numbers of students feel ______ them.

Although we met with some difficulties in building the railway, we were still _____ about finishing it before the deadline.

When the man came in, gun in hand, we all stood there, ________．

My cousins have collected stamps for two years. They have ______ stamps from different countries.

Go out for a walk around our flat after supper, or _________ still in the park.