Wewerebusy________(get)thingsreadyforthetrialproductionwhenhephonedus.
The director recommended that she ________ (study) more English before going abroad.
Hotmetal________asitgrowscooler.
Some molecules are large enough ________ (see) under the electronic microscope.
Night ________ (fall), we hurried home.
He fell asleep immediately last night; he must ________ (be) very tired.
