Without electronic computers，much of today’s advanced technology________.[ ]

We got here Tuesday afternoon.—__________Why didn’t you call usearlier

Stressful environments lead to some unhealthy behavior such as a poor eating habit, which _____ increases the risk of heart disease[ ]

ng on a frozen sports field soundslike a lot of fun Isn’t it rather risky, __9

Carol is getting old and he can’t jump as_______ as he did..