---How did it _________ that all the flowers died ? ---I had forgotten to water them.
-----Would you like to go to see the wedding ceremony? ----No, I wouldn’t, for the tickets are ______ be expensive.
Students in____uniform are doing eye exercises.
---Have you thought of the topic for the composition? ---Not yet, I____it very carefully, but I haven’t decided.
----How about six o’clock outside the park? ---That____me fine.
All our officers are trained to____themselves against knife attacks.