He hurried home, looking behind _____ as he went.
| A．for the time |
| B．from time to time |
| C．at no time |
| D．in no time |
Mr. Smith was so angry at all ______ Bill was doing ______ he left.
| A．that; what | B．that; that | C．which; which | D．what; that |
_______ has recently been done to provide more buses for the people, a shortage of public vehicles remains a serious problem.
| A．What | B．Though what | C．In spite of what | D．However what |
He wondered ________ his son was getting along with the experiment.
| A．when | B．what | C．how | D．which |
In 1492 Columbus and his crew arrived ______ was so-called the New World by the westerners．
| A．in what | B．in which | C．what | D．where |
—It is _______he often fails in exams_______ makes his parents worried about him.
—So, he has to work whole-heartedly.
| A．what, that | B．that, what | C．that, that | D．/, that |