.— Have you thought of a theme for your poster yet? — No, I ______ a lot about it, but I haven’t decided.
Those who have __________ floods and sandstorms knows the importance of environmental protection.
I'm afraid I'll have to; my mom is calling me for supper.
To our relief, the patient's condition is __________
I couldn't __________. The line was busy.
They are building the dam in __________ with another firm.