Being hard-working is of the highest __________ to becoming successful.
—Why does the river smell terrible? —Because large quantities of water__________.
Months ago we sailed ten thousand miles across the open sea, which_____ the Pacific,and we met no storm.
—Why didn’t you buy the calculator? —I ______, but Mother ______ allow me.
—Tom, you didn’t come to the party last night? —I ______, but I suddenly remembered I had homework to do.
As your spoken English gets better, so_____ your written English.