All applications must be ______ the manager by Friday.
A. submitting to
B. submited to
C. submit to
D. submitted to
These letters should ______ us ______ all the information we need.
A. provide … with
B. supply … of
C. supply … for
D. provide … for
He insisted that Jack ______ to hospital immediately.
A. send
B. should send
C. sent
D. be sent
已知H-F、H-Cl、H-Br及H-I键的键能分别为569、431、366及299KJ/mol,试比较HF、HCl、HBr及HI气体分子的热稳定性。