Scientists ______ thousands of chemicals before they decided on the right one in the end.
| A．tried out |
| B．found out |
| C．worked out |
| D．turned out |
John is the only one of the students in the class who never _____ a mistake even when it is pointed out to him.
| A．admits making | B．admitted to make |
| C．admitted making | D．admitted having made |
He said it would be at least three more months ________ he could recover and return to school.
| A．when | B．before | C．since | D．after |
_____ prevent her from going to the party, he pretended to be ill ______.
| A．So as to, by design | B．In order to, on purpose |
| C．So as to, by accident | D．In order to, with purpose |
He said while ______ in the countryside, he ______ a lot of hardships and of course learned a lot.
| A．worked, got through | B．working, went through |
| C．was working, experienced | D．has worked, experienced |
Li Ming is a student who is easy ___ though he has some trouble ____ his lessons.
| A．to be got along with, in | B．to get along with, with |
| C．to get along, in | D．getting along with, with |