In the time of HINI, scientists ____ their spare time to conduct research on the ways of curing the disease.
Shelly had prepared carefully for her English examination so that she could be sure of passing it on her first ________.
—Hi, this way, please. —OK.I sometimes have no sense of ______ when I arrive at the crossroad.
Ten years had passed. I found she had _______.
____ is a good form of exercise for both young and old.
“May I take your order now?” “We’d like three black _______ and two green _______.”