With the successful launch of Tiangong-I, which was ______ breakthrough in space field, China's space dream took a step closer to ______ reality.
A. a; / B. the; a C. a; the D the; /
Higher temperature turning large ice sheet to water would cause _____ rise in sea levels worldwide and change _____ weather on earth.
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It was raining heavily. Little Mary felt cold, so she stood _______ to her mother.
| A．close | B．closely | C．closed | D．closing |
I will never understand how it __________ that you were an hour late on such a short journey.
| A．was happened | B．came about | C．took the place | D．came out |
We won’t give up _______ we should fail ten times.
| A．since | B．even if | C．whether | D．as if |
After that we never saw her again, nor ________from her.
| A．had we heard | B．we heard | C．did we hear | D．we have heard |