Today，we’ll discuss a number of cases ________ beginners of learning English fail to use the language properly.
| A．which | B．as |
| C．why | D．where |
people develop ________ preference for a particular style of learning at ______ early age and these preferences affect learning..
| A．a; an | B．a; 不填 | C．不填； the | D．the; an |
—He is a very hard-working student.
— ______. As far as I know, he often burns the midnight oil.
| A．Youcansaythatagain | B．Absolutelynot |
| C．Heavenknows | D．Noway |
The knowledge that his friends have deserted him is a (n) ______ pill for Mr. Smith to swallow.
| A．extra | B．common | C．bitter | D．effective |
Not having promoted the new digital camera successfully, the company should ______ its original marketing methods.
| A．account for | B．reflect on | C．work out | D．call up |
Sometimes smiles around the world ______ be false, hiding other feelings like anger, fear or worry.
| A．must | B．would | C．should | D．can |