---Sunday is a public holiday, _____children should get close to nature.
---But most of them have several lessons to attend.
| A．when | B．which | C．where | D．what |
---- Where is Jack?
----He _________ football on the playground with those AFS students, but I am not sure.
| A．must be playing | B．must have played |
| C．may be playing | D．may have played |
In our class there are 60 students, of ____________ two thirds are boys.
| A．which | B．them | C．whom | D．who |
Mary wrote books to earn money while John gained his wealth _________ selling Mary’s works.
| A．on | B．by | C．in | D．through |
I hated it when people don’t ___________ their promises.
| A．carry out | B．look out | C．run out | D．find out |
________ hard he tried, he could not change his wife’s mind.
| A．However | B．Whatever | C．As | D．No matter what |