Things made of plastic are usually _______, but they are _______ to get polluted.

_________ difficult it is, don’t lose your heart.[ ]

Though we spent a lot, we think it _____ because we succeeded in the end.

Were you at home at 9:00 pm yesterday?— Yes, I _______ for a call at that time.

______ go walking with us after supper this evening? — Great! I have nothing important to do.